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Catholic DiocesesinItalian Republic (Italy) |  |
Former Circumscription | Type | Became |
| Æca / Eca Æcan(us) | Diocese | Now Titular Episcopal See of Æca and Titular Episcopal See of Æca |
| Acerenza Acheruntin(us) | Archdiocese (Metr.) | Now Archdiocese of Acerenza |
| Acerenza Acheruntin(us) | Archdiocese (Metr.) | Now Archdiocese of Acerenza |
| Acerenza Acheruntin(us) | Diocese | Now Archdiocese of Acerenza |
| Acerenza Acheruntin(us) | Diocese | Now Archdiocese of Acerenza |
| Acerenza e Matera Acheruntin(us) et Materanen(sis) | Archdiocese (Metr.) | Now Archdiocese of Acerenza |
| Acerenza–Matera Acheruntin(us)–Materanen(sis) | Archdiocese (Metr.) | Now Archdiocese of Acerenza |
| Acerno Acernen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Salerno–Campagna–Acerno |
| Acquapendente / Aquipendium Aquipendien(sis) | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Acquapendente |
| Adria Adrien(sis) | Diocese | Now Diocese of Adria–Rovigo |
| Agrigento Agrigentin(us) | Diocese | Now Metropolitan Archdiocese of Agrigento |
| Alatri Alatrin(us) | Diocese | Suppressed into Diocese of Anagni–Alatri |
| Albenga Albinganen(sis) | Diocese | Now Diocese of Albenga–Imperia |
| Ales e Terralba Uxellen(sis) et Terralben(sis) | Diocese | Now Diocese of Ales–Terralba |
| Alessano / Alexanum Alexanen(sis) | Diocese | Now Diocese of Ugento–Santa Maria di Leuca and Titular Episcopal See of Alessano |
| Alghero Algaren(sis) | Diocese | Now Diocese of Alghero–Bosa |
| Alife Aliphan(us) | Diocese | Now Diocese of Alife–Caiazzo |
| Altamura Altamuren(sis) | Territorial Prelature | Now Diocese of Altamura–Gravina–Acquaviva delle Fonti |
| Altamura e Acquaviva delle Fonti Altamuren(sis) et Aquavieven(sis) | Territorial Prelature | Now Diocese of Altamura–Gravina–Acquaviva delle Fonti |
| Altino / Altinum Altinen(sis) | Diocese | Now Titular Episcopal See of Altino and Titular Episcopal See of Altino |
| Amalfi Amalphitan(us) | Archdiocese | Now Archdiocese of Amalfi–Cava de’ Tirreni |
| Amalfi Amalphitan(us) | Diocese | Now Archdiocese of Amalfi–Cava de’ Tirreni |
| Amelia Amerin(us) | Diocese | Suppressed into Diocese of Terni–Narni–Amelia |
| Amiterno / Amiternum Amiternin(us) | Diocese | Now Titular Episcopal See of Amiterno and Titular Episcopal See of Amiterno |
| Ampurias Ampurien(sis) | Diocese | Suppressed into Diocese of Tempio–Ampurias |
| Ampurias e Civita | Diocese | Suppressed into Diocese of Tempio–Ampurias |
| Ampurias e Tempio Ampurien(sis) et Templen(sis) | Diocese | Suppressed into Diocese of Tempio–Ampurias |
| Anagni Anagnin(us) | Diocese | Now Diocese of Anagni–Alatri |
| Ancona | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Ancona–Osimo |
| Ancona Anconitan(us) | Diocese | Now Metropolitan Archdiocese of Ancona–Osimo |
| Ancona e Umana Anconitan(us) et Numanen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Ancona–Osimo |
| Ancona e Umana Anconitan(us) et Numanen(sis) | Diocese | Now Metropolitan Archdiocese of Ancona–Osimo |
| Andria Andrien(sis) | Diocese | Now Diocese of Andria |
| Andria–Montepeloso Andrien(sis)–Montis Pelusii | Diocese | Now Diocese of Andria |
| Anglona Anglonen(sis) | Diocese | Now Diocese of Tursi–Lagonegro and Titular Episcopal See of Anglona |
| Anglona–Tursi Anglonen(sis)–Tursien(sis) | Diocese | Now Diocese of Tursi–Lagonegro and Titular Episcopal See of Anglona |
| Anzio / Antium Antiaten(sis) | Diocese | Now Titular Episcopal See of Anzio and Titular Episcopal See of Anzio |
| Apuania Apuanien(sis) | Diocese | Now Diocese of Massa Carrara–Pontremoli |
| Aquileia Aquilegien(sis) / Aquileien(sis) | Patriarchate | Suppressed into Metropolitan Archdiocese of Gorizia, Metropolitan Archdiocese of Udine |
| Aquileia Aquilegien(sis) / Aquileien(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Gorizia, Metropolitan Archdiocese of Udine |
| Aquino Aquinaten(sis) | Diocese | Suppressed into Diocese of Sora–Aquino–Pontecorvo |
| Aquino, Sora e Pontecorvo Aquinaten(sis), Soran(us) et Pontiscurvi | Diocese | Suppressed into Diocese of Sora–Aquino–Pontecorvo |
| Aquino e Pontecorvo Aquinaten(sis) et Pontiscurvi | Diocese | Suppressed into Diocese of Sora–Aquino–Pontecorvo |
| Arezzo Arretin(us) | Diocese | Now Diocese of Arezzo–Cortona–Sansepolcro |
| Ariano Arianen(sis) Hirpin(us) | Diocese | Now Diocese of Ariano Irpino–Lacedonia |
| Arna Arien(sis) | Diocese | Now Titular Episcopal See of Arna and Titular Episcopal See of Arna |
| Ascoli Satriano Asculan(us) Apuliæ | Diocese | Now Diocese of Cerignola–Ascoli Satriano |
| Ascoli Satriano e Cerignola Asculan(us) Apuliæ et Ceriniolen(sis) | Diocese | Now Diocese of Cerignola–Ascoli Satriano |
| Asolo / Acelum Acellen(sis) | Diocese | Now Titular Episcopal See of Asolo and Titular Episcopal See of Asolo |
| Assisi Assisien(sis) | Diocese | Now Diocese of Assisi–Nocera Umbra–Gualdo Tadino |
| Atri Atrien(sis) / Hatrien(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Pescara–Penne |
| Aveia Vestina | Diocese | Now Titular Episcopal See of Aveia and Titular Episcopal See of Aveia |
| Bagnoregio Balneoregien(sis) | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Bagnoregio |
| Bari Baren(sis) | Diocese | Now Metropolitan Archdiocese of Bari–Bitonto |
| Bari–Canosa Baren(sis)–Canusin(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Bari–Bitonto |
| Beatissima Vergine Maria del Santissimo Rosario Beatissimæ Virginis Mariæ a SS.mo Rosario | Territorial Prelature | Now Territorial Prelature of Pompei |
| Belcastro / Bellicastrum Bellicastren(sis) | Diocese | Now Titular Episcopal See of Belcastro and Titular Episcopal See of Belcastro |
| Belluno Bellunen(sis) | Diocese | Now Diocese of Feltre |
| Belluno Bellunen(sis) | Diocese | Now Diocese of Feltre |
| Belluno e Feltre Bellunen(sis) et Feltren(sis) | Diocese | Now Diocese of Feltre |
| Benevento Beneventan(us) | Diocese | Now Metropolitan Archdiocese of Benevento |
| Bertinoro Brittinorien(sis) | Diocese | Suppressed into Diocese of Forlì–Bertinoro |
| Bevagna / Mevania / Bevania Mevanien(sis) | Diocese | Now Archdiocese of Spoleto–Norcia and Titular Episcopal See of Bevagna |
| Bisaccia Bisacien(sis) | Diocese | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Bisarcio / Bisarchio Bisarchien(sis) | Diocese | Now Diocese of Ozieri and Titular Episcopal See of Bisarcio |
| Bisceglie Vigilien(sis) | Diocese | Suppressed into Archdiocese of Trani–Barletta–Bisceglie |
| Bisenzio / Bisentium / Visentium | Diocese | Now Titular Episcopal See of Acquapendente and Titular Episcopal See of Castro |
| Bisignano Bisinianen(sis) | Diocese | Suppressed into Diocese of San Marco Argentano–Scalea |
| Bitetto / Bitettum Bitecten(sis) | Diocese | Now Metropolitan Archdiocese of Bari–Bitonto and Titular Episcopal See of Bitetto |
| Bitonto Bituntin(us) | Diocese | Suppressed into Metropolitan Archdiocese of Bari–Bitonto |
| Blanda / Blanda Julia Blandan(us) | Diocese | Now Titular Episcopal See of Blanda and Titular Episcopal See of Blanda |
| Blera / Blera Bleran(us) | Diocese | Now Titular Episcopal See of Blera and Titular Episcopal See of Blera |
| Bobbio Bobien(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Genova |
| Bobbio–San Colombano | Diocese | Suppressed into Metropolitan Archdiocese of Genova |
| Boiano Boianen(sis) | Diocese | Now Metropolitan Archdiocese of Campobasso–Boiano |
| Boiano–Campobasso Boianen(sis)–Campobassen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Campobasso–Boiano |
| Boiano–Campobasso Boianen(sis)–Campobassen(sis) | Diocese | Now Metropolitan Archdiocese of Campobasso–Boiano |
| Bologna Bononien(sis) | Diocese | Now Metropolitan Archdiocese of Bologna |
| Bomarzo | Diocese | Now Titular Episcopal See of Bomarzo and Titular Episcopal See of Bomarzo |
| Borgo San Donnino Burgi Sancti Domnini | Diocese | Now Diocese of Fidenza |
| Bosa Bosanen(sis) | Diocese | Suppressed into Diocese of Alghero–Bosa |
| Bova Boven(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Reggio Calabria–Bova |
| Bovino Bovinen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Foggia–Bovino |
| Brescello | Diocese | Now Titular Episcopal See of Brescello and Titular Episcopal See of Brescello |
| Brindisi Brundusin(us) | Archdiocese (Metr.) | Now Archdiocese of Brindisi–Ostuni |
| Brindisi Brundusin(us) | Archdiocese | Now Archdiocese of Brindisi–Ostuni |
| Brindisi Brundusin(us) | Diocese | Now Archdiocese of Brindisi–Ostuni |
| Brixen / Bressanone Brixinen(sis) | Diocese | Now Diocese of Bolzano–Bressanone |
| Brugnato Brugnaten(sis) | Diocese | Suppressed into Titular Episcopal See of Luni |
| Cagli Callien(sis) | Diocese | Suppressed into Diocese of Fano–Fossombrone–Cagli–Pergola |
| Cagli e Pergola Callien(sis) e Pergulan(us) | Diocese | Suppressed into Diocese of Fano–Fossombrone–Cagli–Pergola |
| Cagliari Calaritan(us) | Diocese | Now Metropolitan Archdiocese of Cagliari |
| Caiazzo Caiacen(sis) / Caiatin(us) | Diocese | Suppressed into Diocese of Alife–Caiazzo |
| Calatia / Galazia in Campania Calatin(us) in Campania | Diocese | Now Diocese of Caserta and Titular Episcopal See of Calatia |
| Calvi Calven(sis) | Diocese | Suppressed into Diocese of Teano–Calvi |
| Calvi e Teano Calven(sis) et Theanen(sis) | Diocese | Suppressed into Diocese of Teano–Calvi |
| Camerino Camerinen(sis) | Archdiocese | Now Archdiocese of Camerino–San Severino Marche |
| Camerino Camerinen(sis) | Diocese | Now Archdiocese of Camerino–San Severino Marche |
| Camerino Camerinen(sis) | Diocese | Now Archdiocese of Camerino–San Severino Marche |
| Camerino e Fabriano Camerinen(sis) et Fabrianen(sis) | Diocese | Now Archdiocese of Camerino–San Severino Marche |
| Campagna Campanien(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Salerno–Campagna–Acerno |
| Campli / Camplum Camplen(sis) | Diocese | Now Diocese of Teramo–Atri and Titular Episcopal See of Campli |
| Canne / Cannæ Cannen(sis) | Diocese | Now Archdiocese of Amalfi–Cava de’ Tirreni and Titular Episcopal See of Canne |
| Canosa Canusin(us) | Diocese | Now Titular Episcopal See of Canosa and Titular Episcopal See of Canosa |
| Caorle / Caprulæ Caprulan(us) | Diocese | Now Titular Episcopal See of Caorle and Titular Episcopal See of Caorle |
| Capaccio Caputaquen(sis) | Diocese | Now Diocese of Vallo della Lucania |
| Capaccio–Vallo Caputaquen(sis)–Vallen(sis) | Diocese | Now Diocese of Vallo della Lucania |
| Capri / Capreæ Capritan(us) | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia and Titular Episcopal See of Capri |
| Capua Capuan(us) | Archdiocese (Metr.) | Now Archdiocese of Capua |
| Capua Capuan(us) | Diocese | Now Archdiocese of Capua |
| Cariati Cariaten(sis) | Diocese | Suppressed into Archdiocese of Rossano–Cariati |
| Cariati Cariaten(sis) | Diocese | Suppressed into Archdiocese of Rossano–Cariati |
| Cariati–Cerenzia | Diocese | Suppressed into Archdiocese of Rossano–Cariati |
| Carini / Hyccara / Hyccarum Carien(sis) | Diocese | Now Titular Episcopal See of Carini and Titular Episcopal See of Carini |
| Carinola Carinolen(sis) | Diocese | Now Diocese of Sessa Aurunca and Titular Episcopal See of Carinola |
| Castellammare di Stabia Castri Maris / Stabien(sis) | Diocese | Suppressed into Archdiocese of Sorrento–Castellammare di Stabia |
| Castello Castellan(us) | Diocese | Now Patriarchal See of Venezia and Titular Episcopal See of Castello |
| Castro Castren(sis) | Diocese | Now Diocese of Alghero–Bosa and Titular Episcopal See of Castro di Sardegna |
| Castro / Castrum Castren(sis) | Diocese | Now Archdiocese of Otranto and Titular Episcopal See of Castro di Puglia |
| Castro del Lazio / Castrum in Tuscia | Diocese | Now Titular Episcopal See of Acquapendente and Titular Episcopal See of Castro |
| Catania Catanen(sis) | Archdiocese | Now Metropolitan Archdiocese of Catania |
| Catania Catanen(sis) | Diocese | Now Metropolitan Archdiocese of Catania |
| Catanzaro Catacen(sis) | Archdiocese | Now Metropolitan Archdiocese of Catanzaro–Squillace |
| Catanzaro Catacen(sis) | Diocese | Now Metropolitan Archdiocese of Catanzaro–Squillace |
| Catanzaro–Squillace Catacen(sis)–Squillacen(sis) | Archdiocese | Now Metropolitan Archdiocese of Catanzaro–Squillace |
| Cava Caven(sis) | Diocese | Suppressed into Archdiocese of Amalfi–Cava de’ Tirreni, Diocese of Nocera Inferiore–Sarno |
| Cava e Sarno Caven(sis) et Sarnen(sis) | Diocese | Suppressed into Archdiocese of Amalfi–Cava de’ Tirreni, Diocese of Nocera Inferiore–Sarno |
| Ceneda Ceneten(sis) | Diocese | Now Diocese of Vittorio Veneto |
| Cerenza / Pumentum Geruntin(us) | Diocese | Now Metropolitan Archdiocese of Santa Severina and Titular Episcopal See of Cerenza |
| Cerveteri / Cære / Caerae / Cervétero Cæretan(us) | Diocese | Now Diocese of Porto–Santa Rufina and Titular Episcopal See of Cerveteri |
| Cervia Cervien(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Ravenna–Cervia |
| Cesena Cæsenaten(sis) | Diocese | Now Diocese of Cesena–Sarsina |
| Chieti Theatin(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Chieti–Vasto |
| Chieti Theatin(us) | Diocese | Now Metropolitan Archdiocese of Chieti–Vasto |
| Chiusi Clusin(us) | Diocese | Suppressed into Diocese of Montepulciano–Chiusi–Pienza |
| Chiusi–Pienza Clusin(us)–Pientin(us) | Diocese | Suppressed into Diocese of Montepulciano–Chiusi–Pienza |
| Cingoli Cingulan(us) | Diocese | Suppressed into Diocese of Osimo |
| Città della Pieve Civitatis Plebis | Diocese | Suppressed into Metropolitan Archdiocese of Perugia–Città della Pieve |
| Città Ducale Civitatis Ducalis | Diocese | Now Metropolitan Archdiocese of L’Aquila and Titular Episcopal See of Città Ducale |
| Civita | Diocese | Suppressed into Diocese of Ampurias e Tempio |
| Civita Castellana Civitatis Castellanæ | Diocese | Now Diocese of Civita Castellana |
| Civita Castellana, Orte e Gallese Civitatis Castellanæ, Hortan(us) et Gallesin(us) | Diocese | Now Diocese of Civita Castellana |
| Civita Castellana e Orte Civitatis Castellanæ et Hortan(us) | Diocese | Now Diocese of Civita Castellana |
| Civitate Civitaten(sis) | Diocese | Now Diocese of San Severo and Titular Episcopal See of Civitate |
| Civitavecchia / Centumcellae | Diocese | Now Diocese of Viterbo |
| Colle di Val d’Elsa Collen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino |
| Comacchio Comaclen(sis) | Diocese | Suppressed into Archdiocese of Ferrara–Comacchio |
| Concordia Concordien(sis) | Diocese | Now Diocese of Concordia–Pordenone |
| Conversano Conversanen(sis) | Diocese | Now Diocese of Conversano–Monopoli |
| Conza Compsan(us) | Archdiocese (Metr.) | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Conza Compsan(us) | Diocese | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Conza–Campagna Compsan(us)–Campanien(sis) | Archdiocese (Metr.) | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Conza–Sant’Angelo dei Lombardi–Bisaccia Compsan(us)–Sancti Angeli de Lombardis-Bisacien(sis) | Archdiocese (Metr.) | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Cortona Cortonen(sis) | Diocese | Suppressed into Diocese of Arezzo–Cortona–Sansepolcro |
| Cosenza Cosentin(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Cosenza–Bisignano |
| Cosenza Cosentin(us) | Diocese | Now Metropolitan Archdiocese of Cosenza–Bisignano |
| Cosenza e Bisignano Cosentin(us) et Bisinianen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Cosenza–Bisignano |
| Crotone Crotonen(sis) | Diocese | Now Archdiocese of Crotone–Santa Severina |
| Cuma / Cumæ Cuman(us) | Diocese | Now Titular Episcopal See of Cuma and Titular Episcopal See of Cuma |
| Diano–Teggiano Dianen(sis) | Diocese | Now Diocese of Teggiano–Policastro |
| Dolia Dolien(sis) | Diocese | Now Metropolitan Archdiocese of Cagliari and Titular Episcopal See of Dolia |
| Dragonara Dragonarien(sis) | Diocese | Now Diocese of San Severo and Titular Episcopal See of Dragonara |
| Eclena / Æclanum Æclanen(sis) | Diocese | Now Titular Episcopal See of Frigento and Titular Episcopal See of Eclano |
| Egnazia Appula Egnatin(us) in Apulia | Diocese | Now Titular Episcopal See of Egnazia Appula and Titular Episcopal See of Egnazia Appula |
| Equilio / Equilium Equilien(sis) | Diocese | Now Patriarchal See of Venezia and Titular Episcopal See of Equilio |
| Eraclea / Heraclea Heracleen(sis) | Diocese | Now Patriarchal See of Grado and Titular Episcopal See of Eraclea |
| Erdonia Herdonitan(us) | Diocese | Now Titular Episcopal See of Erdonia and Titular Episcopal See of Erdonia |
| Fabriano e Matelica Fabrianen(sis) et Mathelicen(sis) | Diocese | Now Diocese of Fabriano–Matelica |
| Faenza Faventin(us) | Diocese | Now Diocese of Faenza–Modigliana |
| Fano Fanen(sis) | Diocese | Now Diocese of Fano–Fossombrone–Cagli–Pergola |
| Farfa Farfen(sis) | Territorial Abbacy | United with Diocese of Sabina–Poggio Mirteto |
| Feltre Feltren(sis) | Diocese | Suppressed into Diocese of Belluno–Feltre |
| Feltre Feltren(sis) | Diocese | Suppressed into Diocese of Belluno–Feltre |
| Feltre–Belluno Feltren(sis) et Bellunen(sis) | Diocese | Suppressed into Diocese of Belluno–Feltre |
| Ferentino Ferentin(us) | Diocese | Suppressed into Diocese of Frosinone–Veroli–Ferentino |
| Ferento / Ferentium Ferentien(sis) | Diocese | Now Titular Episcopal See of Bomarzo and Titular Episcopal See of Ferento |
| Fermo Firman(us) | Diocese | Now Metropolitan Archdiocese of Fermo |
| Ferrara Ferrarien(sis) | Archdiocese | Now Archdiocese of Ferrara–Comacchio |
| Ferrara Ferrarien(sis) | Diocese | Now Archdiocese of Ferrara–Comacchio |
| Fiorentino Florentinen(sis) | Diocese | Now Diocese of Lucera–Troia and Titular Episcopal See of Fiorentino |
| Firenze / Florence Florentin(us) | Diocese | Now Metropolitan Archdiocese of Firenze |
| Foggia Fodian(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Foggia–Bovino |
| Foggia Fodian(us) | Diocese | Now Metropolitan Archdiocese of Foggia–Bovino |
| Fondi / Fundi Fundan(us) | Diocese | Now Archdiocese of Gaeta and Titular Episcopal See of Fondi |
| Fontevivo Sancti Bernardi Fontis Vivi | Territorial Abbacy | United with Diocese of Parma |
| Forlì Forolivien(sis) | Diocese | Now Diocese of Forlì–Bertinoro |
| Formia / Formiæ Formian(us) | Diocese | Now Archdiocese of Gaeta and Titular Episcopal See of Formia |
| Forum Popilii / Forlimpopoli Foropopulien(sis) | Diocese | Now Titular Episcopal See of Forum Popilii and Titular Episcopal See of Forum Popilii |
| Forum Traiani / Foro Traiano | Diocese | Now Metropolitan Archdiocese of Oristano and Titular Episcopal See of Fordongianus |
| Fossombrone Forosempronien(sis) | Diocese | Suppressed into Diocese of Fano–Fossombrone–Cagli–Pergola |
| Frigento / Frequentium Frequentin(us) | Diocese | Now Diocese of Avellino and Titular Episcopal See of Frigento |
| Gaeta Caietan(us) | Diocese | Now Archdiocese of Gaeta |
| Gallese / Gallesium Gallesin(us) | Diocese | Now Diocese of Civita Castellana and Titular Episcopal See of Gallese |
| Gallipoli Gallipolitan(us) | Diocese | Suppressed into Diocese of Nardò–Gallipoli |
| Galtelli Galtellinen(sis) | Diocese | Now Metropolitan Archdiocese of Cagliari |
| Galtelli–Nuoro Galtellinen(sis)–Nuoren(sis) | Diocese | Now Metropolitan Archdiocese of Cagliari |
| Genova Ianuen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Genova |
| Genova Ianuen(sis) | Diocese | Now Metropolitan Archdiocese of Genova |
| Genova–Bobbio / Genoa–Bobbio Ianuen(sis)–Bobien(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Genova |
| Gerace Hieracen(sis) | Diocese | Now Diocese of Locri–Gerace |
| Gerace–Locri Hieracen(sis)–Locren(sis) | Diocese | Now Diocese of Locri–Gerace |
| Giovinazzo Iuvenacen(sis) | Diocese | Suppressed into Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Giovinazzo–Terlizzi Iuvenacen(sis)–Terlitien(sis) | Diocese | Suppressed into Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Gorizia Goritien(sis) | Archdiocese (Metr.) | Now Titular Archiepiscopal See of Gradisca |
| Gorizia e Gradisca Goritien(sis) et Gradiscan(us) | Archdiocese (Metr.) | Now Titular Archiepiscopal See of Gradisca |
| Gradisca Gradiscan(us) | Archdiocese | Now Metropolitan Archdiocese of Gorizia and Titular Archiepiscopal See of Gradisca |
| Grado Graden(sis) | Patriarchate | Suppressed into Patriarchal See of Venezia |
| Gravina Gravinen(sis) | Diocese | Suppressed into Diocese of Altamura–Gravina–Acquaviva delle Fonti |
| Gravina Gravinen(sis) | Diocese | Suppressed into Diocese of Altamura–Gravina–Acquaviva delle Fonti |
| Gravina–Irsina Gravinen(sis)–Montis Pelusii | Diocese | Suppressed into Diocese of Altamura–Gravina–Acquaviva delle Fonti |
| Grumentum / Grumento Nova Grumentin(us) | Diocese | Now Titular Episcopal See of Grumentum and Titular Episcopal See of Grumentum |
| Gualdo Tadino / Tadinum Tadinen(sis) | Diocese | Suppressed |
| Guardialfiera Guardien(sis) | Diocese | Now Diocese of Termoli–Larino and Titular Episcopal See of Guardialfiera |
| Guastalla Guastallen(sis) | Diocese | Suppressed into Diocese of Reggio Emilia–Guastalla |
| Iglesias / Villa di Chiesa / Villeclesia Argentaria | Diocese | Now Metropolitan Archdiocese of Cagliari |
| Irsina / Montepeloso Montis Pelusii | Diocese | Suppressed into Diocese of Gravina |
| Isernia Æsernien(sis) | Diocese | Now Diocese of Isernia–Venafro |
| Isernia e Venafro Æsernien(sis) et Venafren(sis) | Diocese | Now Diocese of Isernia–Venafro |
| Isola Insulen(sis) | Diocese | Now Metropolitan Archdiocese of Santa Severina and Titular Episcopal See of Isola |
| Italy | Military Vicariate | Now Military Ordinariate of Ordinariato Militare in Italia |
| L’Aquila Aquilan(us) | Archdiocese | Now Metropolitan Archdiocese of L’Aquila |
| L’Aquila Aquilan(us) | Diocese | Now Metropolitan Archdiocese of L’Aquila |
| La Spezia, Sarzana e Brugnato Spedien(sis), Sarzanen(sis) et Brugnaten(sis) | Diocese | Now Diocese of La Spezia–Sarzana–Brugnato |
| Lacedonia Laquedonien(sis) | Diocese | Suppressed into Diocese of Ariano Irpino–Lacedonia |
| Lanciano Lancianen(sis) | Archdiocese (Metr.) | Now Archdiocese of Lanciano–Ortona |
| Lanciano Lancianen(sis) | Diocese | Now Archdiocese of Lanciano–Ortona |
| Lanciano e Ortona Lancianen(sis) et Ortonen(sis) | Archdiocese (Metr.) | Now Archdiocese of Lanciano–Ortona |
| Lanciano e Ortona Lancianen(sis) et Ortonen(sis) | Archdiocese | Now Archdiocese of Lanciano–Ortona |
| Larino Larinen(sis) | Diocese | Suppressed into Diocese of Termoli–Larino |
| Lavello / Lavellum Lavellan(us) | Diocese | Now Diocese of Venosa and Titular Episcopal See of Lavello |
| Lecce Lycien(sis) | Diocese | Now Metropolitan Archdiocese of Lecce |
| Lentini / Leontium Leontin(us) | Diocese | Now Titular Episcopal See of Lentini and Titular Episcopal See of Lentini |
| Lesina / Lesina Lesinen(sis) | Diocese | Now Diocese of Larino and Titular Episcopal See of Lesina |
| Lettere / Litteræ Litteren(sis) | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia and Titular Episcopal See of Lettere |
| Lettere–Gragnano | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia and Titular Episcopal See of Lettere |
| Lipari Liparen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela |
| Loreto Lauretum | Diocese | Now Diocese of Recanati |
| Loreto de Alma Domo Lauretana | Apostolic Administration | Now Diocese of Recanati |
| Lucca Lucen(sis) | Diocese | Now Archdiocese of Lucca |
| Lucera Lucerin(us) | Diocese | Now Diocese of Lucera–Troia |
| Luni Lunen(sis) | Diocese | Now Diocese of La Spezia–Sarzana–Brugnato and Titular Episcopal See of Luni |
| Luni, Sarzana e Brugnato / La Spezia, Sarzana e Brugnato Lunen(sis), Sarzanen(sis) et Brugnaten(sis) / Spedien(sis), Sarzanen(sis) et Brugnaten(sis) | Diocese | Now Diocese of La Spezia–Sarzana–Brugnato and Titular Episcopal See of Luni |
| Luni, Sarzana e Brugnato Lunen(sis), Sarzanen(sis) et Brugnaten(sis) | Diocese | Now Diocese of La Spezia–Sarzana–Brugnato and Titular Episcopal See of Luni |
| Luni e Sarzana Lunen(sis) et Sarzanen(sis) | Diocese | Now Diocese of La Spezia–Sarzana–Brugnato and Titular Episcopal See of Luni |
| Macerata Maceraten(sis) | Diocese | Now Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Macerata–Tolentino Maceraten(sis)–Tolentin(us) | Diocese | Now Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Manfredonia Sipontin(us) | Archdiocese (Metr.) | Now Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo |
| Manfredonia Sipontin(us) | Archdiocese | Now Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo |
| Manfredonia Sipontin(us) | Diocese | Now Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo |
| Manfredonia–Vieste Sipontin(us)–Vestan(us) | Archdiocese | Now Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo |
| Marsi Marsorum | Diocese | Now Diocese of Avezzano |
| Marsico Nuovo Marsicen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Martirano / Martorano / Martoranum Marturanen(sis) | Diocese | Now Diocese of Lamezia Terme and Titular Episcopal See of Martirano |
| Massa Massen(sis) | Diocese | Now Diocese of Massa Carrara–Pontremoli |
| Massa Carrara Massen(sis) | Diocese | Now Diocese of Massa Carrara–Pontremoli |
| Massa Carrara Massen(sis) | Territorial Abbacy | Now Diocese of Massa Carrara–Pontremoli |
| Massa Lubrense Massalubren(sis) | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia and Titular Episcopal See of Massa Lubrense |
| Massa Marittima Massan(us) | Diocese | Now Diocese of Massa Marittima–Piombino |
| Matelica Mathelicen(sis) | Diocese | Suppressed into Archdiocese of Camerino–San Severino Marche |
| Matera Materanen(sis) | Archdiocese (Metr.) | Now Archdiocese of Acerenza |
| Matera Materanen(sis) | Diocese | Now Archdiocese of Acerenza |
| Matera e Irsina Materanen(sis) et Montis Pelusii | Archdiocese | Now Archdiocese of Acerenza |
| Matera e Irsina Materanen(sis) et Montis Pelusii | Diocese | Now Archdiocese of Acerenza |
| Melfi Melphien(sis) | Diocese | Now Diocese of Melfi–Rapolla–Venosa |
| Melfi–Rapolla Melphien(sis)–Rapollen(sis) | Diocese | Now Diocese of Melfi–Rapolla–Venosa |
| Messina Messanen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela |
| Messina Messanen(sis) | Diocese | Now Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela |
| Milano / Milan (Ambrosian Rite) Mediolanen(sis) | Diocese | Now Metropolitan Archdiocese of Milano |
| Mileto Mileten(sis) | Diocese | Now Diocese of Mileto–Nicotera–Tropea |
| Minervino / Minerbium | Diocese | Now Diocese of Andria and Titular Episcopal See of Minervino Murge |
| Minori / Minora Minoren(sis) | Diocese | Now Archdiocese of Amalfi–Cava de’ Tirreni and Titular Episcopal See of Minori |
| Modena Mutinen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Modena–Nonantola |
| Modena Mutinen(sis) | Diocese | Now Metropolitan Archdiocese of Modena–Nonantola |
| Modigliana Mutilen(sis) | Diocese | Suppressed into Diocese of Faenza–Modigliana |
| Molfetta Melphicten(sis) | Diocese | Now Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Molfetta–Giovinazzo–Terlizzi Melphicten(sis)–Iuvenacen(sis)–Terlitien(sis) | Diocese | Now Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Monopoli Monopolitan(us) | Diocese | Suppressed into Diocese of Conversano–Monopoli |
| Monreale Montis Regalis | Archdiocese (Metr.) | Now Archdiocese of Monreale |
| Monreale Montis Regalis | Archdiocese (Metr.) | Now Archdiocese of Monreale |
| Monreale Montis Regalis | Diocese | Now Archdiocese of Monreale |
| Montalcino Ilcinen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino |
| Montalto Montis Alti | Diocese | Suppressed into Diocese of San Benedetto del Tronto–Ripatransone–Montalto |
| Montecorvino Montis Corbini | Diocese | Now Titular Episcopal See of Vulturara and Titular Episcopal See of Montecorvino |
| Montefeltro Feretran(us) | Diocese | Now Diocese of San Marino–Montefeltro |
| Montefiascone / Mons Faliscus Faliscodunen(sis) | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Montefiascone |
| Montefiascone | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Montefiascone |
| Montefiascone e Corneto Faliscodunen(sis) et Cornetan(us) | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Montefiascone |
| Montemarano Montis Marani | Diocese | Now Diocese of Nusco and Titular Episcopal See of Montemarano |
| Montepulciano Montis Politiani | Diocese | Now Diocese of Montepulciano–Chiusi–Pienza |
| Monteverde Montis Viridis | Diocese | Now Metropolitan Archdiocese of Conza–Sant’Angelo dei Lombardi–Bisaccia and Titular Episcopal See of Monteverde |
| Mottola / Motula Motulen(sis) | Diocese | Now Diocese of Castellaneta and Titular Episcopal See of Mottola |
| Muro Lucano Muran(us) | Diocese | Suppressed into Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Napoli / Naples Neapolitan(us) | Diocese | Now Metropolitan Archdiocese of Napoli |
| Nardò Neritonen(sis) | Diocese | Now Diocese of Nardò–Gallipoli |
| Narni Narnien(sis) | Diocese | Suppressed into Diocese of Terni–Narni–Amelia |
| Nazareth–Canne in Barletta Nazaren(sis)–Cannen(sis) | Archdiocese (Metr.) | Suppressed |
| Nazareth–Canne–Monteverde in Barletta Nazaren(sis)–Cannen(sis)–Montis Viridis | Archdiocese (Metr.) | Suppressed |
| Nazareth in Barletta Nazaren(sis) | Archdiocese (Metr.) | Suppressed |
| Nepi Nepesin(us) | Diocese | Now Diocese of Civita Castellana and Titular Episcopal See of Nepi |
| Nepi e Sutri Nepesin(us) et Sutrin(us) | Diocese | Now Diocese of Civita Castellana and Titular Episcopal See of Nepi |
| Nicastro Neocastren(sis) | Diocese | Now Diocese of Lamezia Terme |
| Nicotera Nicotrien(sis) | Diocese | Suppressed into Diocese of Mileto–Nicotera–Tropea |
| Nicotera–Tropea Nicotrien(sis)–Tropien(sis) | Diocese | Suppressed into Diocese of Mileto–Nicotera–Tropea |
| Nocera de’ Pagani Nucerin(us) Paganorum | Diocese | Now Diocese of Nocera Inferiore–Sarno |
| Nocera Umbra Nucerin(us) | Diocese | Suppressed into Diocese of Assisi–Nocera Umbra–Gualdo Tadino |
| Nocera Umbra–Gualdo Tadino Nucerin(us)–Tadinen(sis) | Diocese | Suppressed into Diocese of Assisi–Nocera Umbra–Gualdo Tadino |
| Noli Naulen(sis) | Diocese | Suppressed into Diocese of Savona–Noli |
| Nomento / Nomentum Nomentan(us) | Diocese | Now Titular Episcopal See of Vescovìo and Titular Episcopal See of Nomento |
| Nonantola Nonantulan(us) | Territorial Abbacy | Suppressed into Metropolitan Archdiocese of Modena–Nonantola |
| Norcia Nursin(us) | Diocese | Suppressed into Archdiocese of Spoleto–Norcia |
| Nuceria | Diocese | Now Diocese of Nocera Inferiore–Sarno |
| Numana / Umana Numanen(sis) | Diocese | Now Metropolitan Archdiocese of Ancona–Osimo and Titular Episcopal See of Numana |
| Nusco Nuscan(us) | Diocese | Suppressed into Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia |
| Oderzo / Opitergium Opitergin(us) | Diocese | Now Titular Episcopal See of Oderzo and Titular Episcopal See of Oderzo |
| Ogliastra Oleastren(sis) | Diocese | Now Diocese of Lanusei |
| Olivolo / Rialto | Diocese | Now Patriarchal See of Venezia and Titular Episcopal See of Castello |
| Oppido Mamertina Oppiden(sis) | Diocese | Now Diocese of Oppido Mamertina–Palmi |
| Orte / Hortanum Hortan(us) | Diocese | Now Diocese of Civita Castellana and Titular Episcopal See of Orte |
| Ortona Ortonen(sis) | Diocese | Suppressed into Archdiocese of Lanciano–Ortona |
| Orvieto Urbevetan(us) | Diocese | Now Diocese of Orvieto–Todi |
| Osimo Auximan(us) | Diocese | Suppressed into Metropolitan Archdiocese of Ancona–Osimo |
| Osimo Auximan(us) | Diocese | Suppressed into Metropolitan Archdiocese of Ancona–Osimo |
| Osimo e Cingoli Auximan(us) et Cingulan(us) | Diocese | Suppressed into Metropolitan Archdiocese of Ancona–Osimo |
| Ostia Ostien(sis) | Diocese | Now Diocese of Ostia |
| Ostia–Velletri Ostien(sis)–Velitern(us) | Diocese | Now Diocese of Ostia |
| Ostuni Ostunen(sis) | Diocese | Suppressed into Archdiocese of Brindisi–Ostuni |
| Otranto Hydruntin(us) | Archdiocese (Metr.) | Now Archdiocese of Otranto |
| Otranto Hydruntin(us) | Diocese | Now Archdiocese of Otranto |
| Otricoli / Otriculum Otriculan(us) | Diocese | Now Titular Episcopal See of Otricoli and Titular Episcopal See of Otricoli |
| Ottana / Othana Othanen(sis) | Diocese | Now Titular Episcopal See of Ottana and Titular Episcopal See of Ottana |
| Palermo Panormitan(us) | Diocese | Now Metropolitan Archdiocese of Palermo |
| Passo Corese / Cures / Cures Sabinorum Curen(sis) | Diocese | Now Titular Episcopal See of Nomento and Titular Episcopal See of Passo Corese |
| Pæstum | Diocese | Now Diocese of Vallo della Lucania |
| Patti e Lipari Pacten(sis) et Liparen(sis) | Diocese | Now Diocese of Patti |
| Penne Pinnen(sis) | Diocese | Now Metropolitan Archdiocese of Pescara–Penne |
| Penne–Atri Pinnen(sis)–Atrien(sis) / Pinnen(sis)–Hatrien(sis) | Diocese | Now Metropolitan Archdiocese of Pescara–Penne |
| Penne e Pescara Pinnen(sis) et Piscarien(sis) | Diocese | Now Metropolitan Archdiocese of Pescara–Penne |
| Perugia Perusin(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Perugia–Città della Pieve |
| Perugia Perusin(us) | Archdiocese | Now Metropolitan Archdiocese of Perugia–Città della Pieve |
| Perugia Perusin(us) | Diocese | Now Metropolitan Archdiocese of Perugia–Città della Pieve |
| Pesaro Pisauren(sis) | Diocese | Now Metropolitan Archdiocese of Pesaro |
| Pescia Piscien(sis) | Territorial Prelature | Now Diocese of Pescia |
| Piacenza | Diocese | Now Diocese of Piacenza–Bobbio |
| Piana dei Greci (Italo-Albanese Rite) Pianen(sis) Græcorum | Diocese | Now Diocese of Piana degli Abanesi |
| Pienza Pientin(us) | Diocese | Suppressed into Diocese of Chiusi–Pienza |
| Pisa Pisan(us) | Diocese | Now Metropolitan Archdiocese of Pisa |
| Pistoia Pistorien(sis) | Diocese | Now Diocese of Pistoia |
| Pistoia–Prato Pistorien(sis)–Praten(sis) | Diocese | Now Diocese of Pistoia |
| Ploaghe Plovacen(sis) | Diocese | Now Metropolitan Archdiocese of Sassari and Titular Episcopal See of Ploaghe |
| Poggio Mirteto Mandelen(sis) | Diocese | Suppressed into Diocese of Sabina–Poggio Mirteto |
| Policastro Policastren(sis) | Diocese | Suppressed into Diocese of Teggiano–Policastro |
| Polignano / Polinianum Polinianen(sis) | Diocese | Now Diocese of Monopoli and Titular Episcopal See of Polignano |
| Pomposa Pomposæ | Territorial Abbacy | United with Archdiocese of Ferrara–Comacchio |
| Pontecorvo Pontiscurvi | Diocese | Suppressed into Diocese of Aquino, Sora e Pontecorvo |
| Pontremoli Apuan(us) | Diocese | Suppressed into Diocese of Massa Carrara–Pontremoli |
| Porto Portuen(sis) | Diocese | Now Diocese of Porto–Santa Rufina |
| Porto e Santa Rufina Portuen(sis) et Sanctæ Rufinæ | Diocese | Now Diocese of Porto–Santa Rufina |
| Porto e Santa Rufina Portuen(sis) et Sanctæ Rufinæ | Diocese | Now Diocese of Porto–Santa Rufina |
| Porto e Santa Rufina e Civitavecchia Portuen(sis) et Sanctæ Rufinæ et Centumcellarum | Diocese | Now Diocese of Porto–Santa Rufina |
| Potenza Potentin(us) | Diocese | Now Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Potenza e Marsico Nuovo Potentin(us) et Marsicen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Potenza e Marsico Nuovo Potentin(us) et Marsicen(sis) | Archdiocese | Now Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Potenza e Marsico Nuovo Potentin(us) et Marsicen(sis) | Diocese | Now Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo |
| Priverno / Piperno Privernen(sis) | Diocese | Suppressed into Diocese of Latina–Terracina–Sezze–Priverno |
| Ragusa e Siracusa Ragusien(sis) et Syracusan(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Siracusa |
| Rapolla Rapollen(sis) | Diocese | Suppressed into Diocese of Melfi–Rapolla–Venosa |
| Ravello Rebellen(sis) | Diocese | Now Archdiocese of Amalfi–Cava de’ Tirreni and Titular Episcopal See of Ravello |
| Ravello–Scala Rebellen(sis)–Scalen(sis) | Diocese | Now Archdiocese of Amalfi–Cava de’ Tirreni and Titular Episcopal See of Ravello |
| Ravenna Ravennaten(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Ravenna–Cervia |
| Ravenna Ravennaten(sis) | Diocese | Now Metropolitan Archdiocese of Ravenna–Cervia |
| Ravenna e Cervia Ravennaten(sis) et Cervien(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Ravenna–Cervia |
| Recanati Recineten(sis) | Diocese | Suppressed into Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Recanati Recineten(sis) | Diocese | Suppressed into Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Recanati–Loreto Recineten(sis)–ab Alma Domo Lauretana | Diocese | Suppressed into Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Reggio Calabria Rheginen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Reggio Calabria–Bova |
| Reggio Calabria Rheginen(sis) | Diocese | Now Metropolitan Archdiocese of Reggio Calabria–Bova |
| Reggio Emilia Regien(sis) in Æmilia | Diocese | Now Diocese of Reggio Emilia–Guastalla |
| Ripatransone Ripan(us) | Diocese | Now Diocese of San Benedetto del Tronto–Ripatransone–Montalto |
| Ripatransone–San Benedetto del Tronto Ripan(us)–Sancti Benedicti ad Truentum | Diocese | Now Diocese of San Benedetto del Tronto–Ripatransone–Montalto |
| Rossano Rossanen(sis) | Archdiocese | Now Archdiocese of Rossano–Cariati |
| Rossano Rossanen(sis) | Diocese | Now Archdiocese of Rossano–Cariati |
| Rossano e Cariati Rossanen(sis) et Cariaten(sis) | Archdiocese | Now Archdiocese of Rossano–Cariati |
| Ruvo Ruben(sis) | Diocese | Suppressed into Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Ruvo Ruben(sis) | Diocese | Suppressed into Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Ruvo e Bitonto Ruben(sis) et Bituntin(us) | Diocese | Suppressed into Diocese of Molfetta–Ruvo–Giovinazzo–Terlizzi |
| Sabiana / Sebana | Diocese | Now Diocese of Bolzano–Bressanone and Titular Episcopal See of Sabiona |
| Sabina Sabinen(sis) | Diocese | Now Diocese of Sabina–Poggio Mirteto |
| Sabina e Poggio Mirteto Sabinen(sis) et Mandelen(sis) | Diocese | Now Diocese of Sabina–Poggio Mirteto |
| Sabiona-Säben Sebanen(sis) | Diocese | Now Diocese of Bolzano–Bressanone |
| Salerno Salernitan(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Salerno–Campagna–Acerno |
| Salerno Salernitan(us) | Diocese | Now Metropolitan Archdiocese of Salerno–Campagna–Acerno |
| Salpi / Salapia Salapin(us) | Diocese | Now Archdiocese of Trani–Barletta–Bisceglie and Titular Episcopal See of Salpi |
| San Colombano Sancti Columbani | Territorial Abbacy | United with Diocese of Piacenza–Bobbio |
| San Leone Sancti Leonis | Diocese | Now Metropolitan Archdiocese of Santa Severina and Titular Episcopal See of San Leone |
| San Marco Sancti Marci | Diocese | Now Diocese of San Marco Argentano–Scalea |
| San Marco e Bisignano Sancti Marci et Bisinianen(sis) | Diocese | Now Diocese of San Marco Argentano–Scalea |
| San Martino al Monte Cimino Sancti Martini ad Montem Ciminum | Territorial Abbacy | United with Diocese of Viterbo |
| San Michele Arcangelo di Montescaglioso Sancti Angeli Montis Caveosi | Territorial Abbacy | United with Archdiocese of Matera–Irsina |
| San Paolo fuori le Mura / Saint Paul Outside the Walls Sancti Pauli de Urbe | Territorial Abbacy | Suppressed into Papal See of Roma |
| San Paolo fuori le Mura / Saint Paul Outside the Walls Sancti Pauli de Urbe | Territorial Abbacy | Suppressed into Papal See of Roma |
| San Salvatore Maggiore Sanctissimi Salvatoris Maioris | Territorial Abbacy | United with Diocese of Rieti |
| San Severino Sancti Severini in Piceno | Diocese | Suppressed into Archdiocese of Camerino–San Severino Marche |
| San Severino Sancti Severini in Piceno | Diocese | Suppressed into Archdiocese of Camerino–San Severino Marche |
| San Severino–Treia Sancti Severini in Piceno–Trien(sis) | Diocese | Suppressed into Archdiocese of Camerino–San Severino Marche |
| Sansepolcro / Borgo San Sepolcro Biturgen(sis) / Burgi Sancti Sepulchri | Diocese | Suppressed into Diocese of Arezzo–Cortona–Sansepolcro |
| Sant’Agata de’ Goti Sanctæ Agathæ Gothorum | Diocese | Suppressed into Diocese of Cerreto Sannita–Telese–Sant’Agata de’ Goti |
| Sant’Angelo dei Lombardi Sancti Angeli de Lombardis | Diocese | Now Metropolitan Archdiocese of Conza–Sant’Angelo dei Lombardi–Bisaccia |
| Sant’Angelo dei Lombardi–Bisaccia Sancti Angeli de Lombardis–Bisacien(sis) | Diocese | Now Metropolitan Archdiocese of Conza–Sant’Angelo dei Lombardi–Bisaccia |
| Sant’Angelo in Vado / Tifernum Metaurum | Diocese | Suppressed into Diocese of Urbania–Sant’Angelo in Vado |
| Santa Giusta Sanctæ Iustæ | Diocese | Now Metropolitan Archdiocese of Oristano and Titular Episcopal See of Santa Giusta |
| Santa Lucia del Mela Sanctæ Luciæ | Territorial Prelature | Suppressed into Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela |
| Santa Maria di Polsi Sanctæ Mariæ de Pulsi | Territorial Abbacy | United with Diocese of Locri–Gerace |
| Santa Rufina Sanctæ Rufinæ | Diocese | Suppressed into Diocese of Porto–Santa Rufina |
| Santa Severina Sanctæ Severinæ | Archdiocese (Metr.) | Suppressed into Archdiocese of Crotone–Santa Severina |
| Santa Severina Sanctæ Severinæ | Diocese | Suppressed into Archdiocese of Crotone–Santa Severina |
| Santi Vincenzo ed Anastasio alle tre Fontane Sancti Vincentii et Anastasii ad Aquas Salvias | Territorial Abbacy | Suppressed into Papal See of Roma |
| Santissimo Salvatore Sanctissimi Salvatoris Messanæ | Territorial Abbacy | United with Metropolitan Archdiocese of Messina–Lipari–Santa Lucia del Mela |
| Sarno Sarnen(sis) | Diocese | Suppressed into Diocese of Cava e Sarno |
| Sarsina Sarsinaten(sis) | Diocese | Suppressed into Diocese of Cesena–Sarsina |
| Sarzana Sarzanen(sis) | Diocese | Suppressed into Titular Episcopal See of Luni |
| Sassari Turritan(us) | Diocese | Now Metropolitan Archdiocese of Sassari |
| Satriano / Lucania / Satrianum | Diocese | Now Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia and Titular Episcopal See of Satriano |
| Satriano e Campagna Satrianen(sis) et Campanien(sis) | Diocese | Now Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia and Titular Episcopal See of Satriano |
| Savona Savonen(sis) | Diocese | Now Diocese of Savona–Noli |
| Savona e Noli Savonen(sis) et Naulen(sis) | Diocese | Now Diocese of Savona–Noli |
| Scala Scalen(sis) | Diocese | Now Titular Episcopal See of Ravello and Titular Episcopal See of Scala |
| Segni Signin(us) | Diocese | Suppressed into Diocese of Velletri–Segni |
| Sepino Sæpinum | Diocese | Now Titular Episcopal See of Sepino and Titular Episcopal See of Sepino |
| Sezze Setin(us) | Diocese | Suppressed into Diocese of Latina–Terracina–Sezze–Priverno |
| Siena Senen(sis) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino |
| Siena Senen(sis) | Diocese | Now Metropolitan Archdiocese of Siena–Colle di Val d’Elsa–Montalcino |
| Silicia (Italo-Albanese Rite) | Ordinariate | Now Diocese of Piana degli Abanesi |
| Siracusa Syracusan(us) | Archdiocese (Metr.) | Now Metropolitan Archdiocese of Siracusa |
| Siracusa Syracusan(us) | Diocese | Now Metropolitan Archdiocese of Siracusa |
| Sora Soran(us) | Diocese | Now Diocese of Aquino, Sora e Pontecorvo |
| Sorrento Surrentin(us) | Archdiocese (Metr.) | Now Archdiocese of Sorrento–Castellammare di Stabia |
| Sorrento Surrentin(us) | Archdiocese | Now Archdiocese of Sorrento–Castellammare di Stabia |
| Sorrento Surrentin(us) | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia |
| Sorres Sorren(sis) | Diocese | Now Metropolitan Archdiocese of Sassari and Titular Episcopal See of Sorres |
| Sovana–Pitigliano Soanen(sis)–Pitilianen(sis) | Diocese | Now Diocese of Pitigliano–Sovana–Orbetello |
| Sovana–Pitigliano–Orbetello Soanen(sis)–Pitilianen(sis)–Urbetellien(sis) | Diocese | Now Diocese of Pitigliano–Sovana–Orbetello |
| Spello / Hispellum Hispellen(sis) | Diocese | Now Archdiocese of Spoleto–Norcia and Titular Episcopal See of Spello |
| Spoleto Spoletan(us) | Archdiocese | Now Archdiocese of Spoleto–Norcia |
| Spoleto Spoletan(us) | Diocese | Now Archdiocese of Spoleto–Norcia |
| Squillace Squillacen(sis) | Diocese | Suppressed into Metropolitan Archdiocese of Catanzaro–Squillace |
| Strongoli Strongulen(sis) | Diocese | Now Metropolitan Archdiocese of Santa Severina and Titular Episcopal See of Strongoli |
| Suelli Suellen(sis) | Diocese | Now Metropolitan Archdiocese of Cagliari and Titular Episcopal See of Suelli |
| Sulci / Sulci Sulcitan(us) | Diocese | Now Metropolitan Archdiocese of Cagliari and Titular Episcopal See of Sulci |
| Sulcis / Sant’Antioco / Solci / Sulci | Diocese | Now Metropolitan Archdiocese of Cagliari |
| Sulmona Sulmonen(sis) | Diocese | Now Diocese of Sulmona–Valva |
| Sutri / Sutrium Sutrin(us) | Diocese | Now Titular Episcopal See of Nepi and Titular Episcopal See of Sutri |
| Taormina / Tauromenium Tauromenitan(us) | Diocese | Now Titular Episcopal See of Taormina and Titular Episcopal See of Taormina |
| Taranto Tarentin(us) | Diocese | Now Metropolitan Archdiocese of Taranto |
| Tarquinia e Civitaveccia / Corneto e Civitavecchia Tarquinien(sis) et Centumcellarum | Diocese | Now Diocese of Viterbo |
| Tauriano / Taurianum Taurianien(sis) | Diocese | Now Diocese of Mileto–Nicotera–Tropea and Titular Episcopal See of Tauriano |
| Teano Theanen(sis) | Diocese | Now Diocese of Calvi e Teano |
| Telese / Cerreto Sannita Cerretan(us) / Thelesin(us) | Diocese | Now Diocese of Cerreto Sannita–Telese–Sant’Agata de’ Goti |
| Tempio Templen(sis) | Diocese | Now Diocese of Ampurias e Tempio |
| Teramo Aprutin(us) / Teramen(sis) | Diocese | Now Diocese of Teramo–Atri |
| Teramo e Atri Aprutin(us) et Hatrien(sis) / Teramen(sis) et Atrien(sis) | Diocese | Now Diocese of Teramo–Atri |
| Termini Imerese / Termæ Himeræ Himeren(sis) | Diocese | Now Titular Episcopal See of Termini Imerese and Titular Episcopal See of Termini Imerese |
| Termoli Thermularum | Diocese | Now Diocese of Termoli–Larino |
| Terni Interamnen(sis) | Diocese | Now Archdiocese of Spoleto–Norcia |
| Terni, Narni, e Amelia Interamnen(sis), Narnien(sis) et Amerin(us) | Diocese | Now Archdiocese of Spoleto–Norcia |
| Terni e Narni Interamnen(sis) et Narnien(sis) | Diocese | Now Archdiocese of Spoleto–Norcia |
| Terracina Terracinen(sis) | Diocese | Now Diocese of Latina–Terracina–Sezze–Priverno |
| Terracina, Priverno e Sezze Terracinen(sis), Privernen(sis) et Setin(us) | Diocese | Now Diocese of Latina–Terracina–Sezze–Priverno |
| Terracina–Latina, Priverno e Sezze Terracinen(sis)–Latinen(sis), Privernen(sis) et Setin(us) | Diocese | Now Diocese of Latina–Terracina–Sezze–Priverno |
| Terralba Terralben(sis) | Diocese | Suppressed into Diocese of Ales–Terralba |
| Thurio Thurien(sis) | Diocese | Now Archdiocese of Rossano–Cariati and Titular Episcopal See of Thurio |
| Tindari / Tyndaris Tyndaritan(us) | Diocese | Now Titular Episcopal See of Tindari and Titular Episcopal See of Tindari |
| Todi Tudertin(us) | Diocese | Suppressed into Diocese of Orvieto–Todi |
| Tolentino Tolentin(us) | Diocese | Suppressed into Diocese of Macerata–Tolentino–Recanati–Cingoli–Treia |
| Torcello / Turricellum / Turris Torcellan(us) | Diocese | Now Patriarchal See of Venezia and Titular Episcopal See of Torcello |
| Torino / Turin Taurinen(sis) | Diocese | Now Metropolitan Archdiocese of Torino |
| Tortiboli / Tortibulum Tortibulan(us) | Diocese | Now Diocese of Lucera–Troia and Titular Episcopal See of Tortiboli |
| Trani Tranen(sis) | Archdiocese (Metr.) | Now Archdiocese of Trani–Barletta–Bisceglie |
| Trani Tranen(sis) | Diocese | Now Archdiocese of Trani–Barletta–Bisceglie |
| Trani e Barletta Tranen(sis) et Barolen(sis) | Archdiocese (Metr.) | Now Archdiocese of Trani–Barletta–Bisceglie |
| Trani e Barletta Tranen(sis) et Barolen(sis) | Archdiocese | Now Archdiocese of Trani–Barletta–Bisceglie |
| Trani e Bisceglie Tranen(sis) et Vigilien(sis) | Archdiocese (Metr.) | Now Archdiocese of Trani–Barletta–Bisceglie |
| Trani e Nazareth e Bisceglie Tranen(sis) et Nazaren(sis) et Vigilien(sis) | Archdiocese (Metr.) | Now Archdiocese of Trani–Barletta–Bisceglie |
| Treba / Treba Treban(us) | Diocese | Now Diocese of Anagni–Alatri and Titular Episcopal See of Treba |
| Treia Trien(sis) | Diocese | Suppressed into Diocese of San Severino |
| Trento / Trent Tridentin(us) | Archdiocese | Now Metropolitan Archdiocese of Trento |
| Trento / Trent Tridentin(us) | Diocese | Now Metropolitan Archdiocese of Trento |
| Trevi / Trebia Trebian(us) | Diocese | Now Archdiocese of Spoleto–Norcia and Titular Episcopal See of Trevi |
| Trevico Trevicen(sis) | Diocese | Now Diocese of Lacedonia and Titular Episcopal See of Trevico |
| Tricala / Trecalæ Trecalitan(us) | Diocese | Now Titular Episcopal See of Tricala and Titular Episcopal See of Tricala |
| Trieste Tergestin(us) | Diocese | Now Diocese of Trieste |
| Trieste–Koper Tergestin(us)–Iustinopolitan(us) | Diocese | Now Diocese of Trieste |
| Troia Troian(us) | Diocese | Suppressed into Diocese of Lucera–Troia |
| Troina / Troyna Troynien(sis) | Diocese | Now Titular Episcopal See of Troina and Titular Episcopal See of Troina |
| Tropea Tropien(sis) | Diocese | Suppressed into Diocese of Nicotera–Tropea |
| Tuscanella Tuscanen(sis) | Diocese | Suppressed into Diocese of Viterbo |
| Tuscania / Tuscania Tuscanen(sis) | Diocese | Now Diocese of Viterbo and Titular Episcopal See of Tuscania |
| Udine Utinen(sis) | Diocese | Now Metropolitan Archdiocese of Udine |
| Ugento Uxentin(us) | Diocese | Now Diocese of Ugento–Santa Maria di Leuca |
| Umbriatico Umbriaticen(sis) | Diocese | Now Metropolitan Archdiocese of Santa Severina and Titular Episcopal See of Umbriatico |
| Urbania–Sant’Angelo in Vado Urbanien(sis)–Sancti Angeli in Vado | Diocese | Suppressed into Archdiocese of Urbino–Urbania–Sant’Angelo in Vado |
| Urbino | Archdiocese (Metr.) | Now Archdiocese of Urbino–Urbania–Sant’Angelo in Vado |
| Urbino | Diocese | Now Archdiocese of Urbino–Urbania–Sant’Angelo in Vado |
| Urbino–Urbania–Sant’Angelo in Vado Urbinaten(sis)–Urbanien(sis)–Sancti Angeli in Vado | Archdiocese (Metr.) | Now Archdiocese of Urbino–Urbania–Sant’Angelo in Vado |
| Uselli / Ales Uxellen(sis) | Diocese | Now Diocese of Ales–Terralba |
| Vallo di Lucania Vallensis in Lucania | Diocese | Now Diocese of Vallo della Lucania |
| Valva Valven(sis) | Diocese | Suppressed into Diocese of Sulmona–Valva |
| Valva e Sulmona Valven(sis) et Sulmonen(sis) | Diocese | Now Diocese of Sulmona–Valva |
| Velletri Velitern(us) | Diocese | Now Diocese of Ostia |
| Velletri e Segni Velitern(us) et Signin(us) | Diocese | Now Diocese of Ostia |
| Venafro Venafren(sis) | Diocese | Suppressed into Diocese of Isernia–Venafro |
| Venosa Venusin(us) | Diocese | Suppressed into Diocese of Melfi–Rapolla–Venosa |
| Ventimiglia / Vintimille Ventimilien(sis) | Diocese | Now Diocese of Ventimiglia–San Remo |
| Ventimiglia / Vintimille Ventimilien(sis) | Diocese | Now Diocese of Ventimiglia–San Remo |
| Vercelli Vercellen(sis) | Diocese | Now Metropolitan Archdiocese of Vercelli |
| Veroli Verulan(us) | Diocese | Now Diocese of Frosinone–Veroli–Ferentino |
| Veroli–Frosinone Verulan(us)–Frusinaten(sis) | Diocese | Now Diocese of Frosinone–Veroli–Ferentino |
| Vescovìo / Santa Maria in Vescovio / Forum Novum / Sabina Foronovan(us) | Diocese | Now Diocese of Sabina–Poggio Mirteto and Titular Episcopal See of Vescovìo |
| Vibo Valentia / Vibo Vibonen(sis) | Diocese | Now Diocese of Mileto–Nicotera–Tropea and Titular Episcopal See of Vibo Valentia |
| Vico Equense Vican(us) | Diocese | Now Archdiocese of Sorrento–Castellammare di Stabia and Titular Episcopal See of Vico Equense |
| Vieste Vestan(us) | Diocese | Suppressed into Archdiocese of Manfredonia–Vieste–San Giovanni Rotondo |
| Vigevano Viglevanen(sis) | Archdiocese (Metr.) | Now Diocese of Vigevano |
| Viterbo Viterbien(sis) | Diocese | Now Diocese of Viterbo |
| Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino Viterbien(sis), Aquipendien(sis), Balneoregien(sis), Faliscodunen(sis), Tuscanen(sis) et Sancti Martini ad Montem Ciminum | Diocese | Now Diocese of Viterbo |
| Viterbo e Tuscania Viterbiensis et Tuscanen(sis) | Diocese | Now Diocese of Viterbo |
| Voghenza | Diocese | Now Archdiocese of Ferrara–Comacchio |
| Vulturara / Vulturaria Vulturarien(sis) | Diocese | Now Diocese of Lucera–Troia and Titular Episcopal See of Vulturara |
| Zuglio / Iulium Carnicum Iulien(sis) | Diocese | Now Titular Episcopal See of Zuglio and Titular Episcopal See of Zuglio |
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