Ecclesiastical Provinces (42) | Type | Churches and Bishops |
 Roma / Rome | Papal See |            Also covers Vatican City State  . |
 Albano | Diocese |    |
| Frascati | Diocese |  |
| Ostia | Diocese |  The Cardinal Dean of the College of Cardinals has been the Bishop of Ostia since 1150. The Vicar General for the Vicariate of Rome has been the Apostolic Administrator of Ostia since 1966.11.18. |
| Palestrina | Diocese | |
| Porto–Santa Rufina | Diocese |  united æque principaliter with Civitavecchia 1825.12.10–1854.06.14 |
| Sabina–Poggio Mirteto (–Farfa) | Diocese | |
| Velletri–Segni | Diocese | United æque principaliter with Segni 1981.10.20–1986.09.30 |
 Venezia / Venice | Patriarchate |    United æque principaliter with Cittanova 1451.10.08–1465 |
| Adria–Rovigo | Diocese | |
| Belluno–Feltre | Diocese | United æque principaliter with Feltre 1197–1462, 1818.05.01–1986.09.30 |
| Chioggia | Diocese | |
| Concordia–Pordenone | Diocese | |
| Padova / Padua | Diocese |  |
| Treviso | Diocese | |
| Verona | Diocese | |
| Vicenza | Diocese | |
| Vittorio Veneto | Diocese | |
 Agrigento | Metr. Archdiocese |  |
| Caltanissetta | Diocese | |
| Piazza Armerina / Platia | Diocese | |
| Ancona–Osimo | Metr. Archdiocese | |
| Fabriano–Matelica | Diocese | United æque principaliter with Camerino 1728.11.15–1785.07.08; united æque principaliter with Matelica 1785.07.08–1986.09.30 |
| Jesi | Diocese | |
| Senigallia | Diocese | |
 Loreto | Territorial Prelature | United æque principaliter with Recanati 1592.02.09–1934.09.15 |
| Bari–Bitonto | Metr. Archdiocese | United æque principaliter with Canosa 844–1101.08.07 |
 Trani–Barletta–Bisceglie (–Nazareth) | Archdiocese | United æque principaliter with Barletta 1860.04.21–1986.09.30 |
| Altamura–Gravina–Acquaviva delle Fonti | Diocese | United æque principaliter with Acquaviva delle Fonti 1848.08.17–1986.09.30 |
| Andria | Diocese | United æque principaliter with Irsina 1452–1479 |
| Conversano–Monopoli | Diocese | |
| Molfetta–Ruvo–Giovinazzo–Terlizzi | Diocese | United æque principaliter with Giovinazzo and Terlizzi 1836.03.04–1982.09.04 |
| Benevento | Metr. Archdiocese | United æque principaliter with Manfredonia 663–1020 |
| Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia | Archdiocese | United æque principaliter with Bisaccia 1513–1517 and 1540.11.03–1986.09.30, with Conza 1921.09.30–1986.09.30 |
| Ariano Irpino–Lacedonia | Diocese | |
| Avellino | Diocese | United æque principaliter with Frigento 1466.05.09–1818.06.27 |
| Cerreto Sannita–Telese–Sant’Agata de’ Goti | Diocese | United æque principaliter with Alife 1820.12.14–1852.07.06 |
 Montevergine | Territorial Abbacy |  |
| Bologna | Metr. Archdiocese |  |
| Ferrara–Comacchio (–Pomposa) | Archdiocese | United æque principaliter with Comacchio 1908.12.29–1920.07.07 |
| Faenza–Modigliana | Diocese | |
| Imola | Diocese | |
| Cagliari | Metr. Archdiocese | United æque principaliter with Iglesias 1514.01.09–1763.05.18 |
| Iglesias | Diocese | United æque principaliter with Cagliari 1514.01.09–1763.05.18 |
| Lanusei | Diocese | |
| Nuoro | Diocese | |
| Campobasso–Boiano | Metr. Archdiocese | |
| Isernia–Venafro | Diocese | United æque principaliter with Venafro 1032–1207, 1852.06.19–1986.09.30 |
| Termoli–Larino | Diocese | |
| Trivento | Diocese | |
| Catania | Metr. Archdiocese | |
| Acireale | Diocese | |
| Caltagirone | Diocese |  |
| Catanzaro–Squillace | Metr. Archdiocese | |
| Crotone–Santa Severina | Archdiocese | |
| Lamezia Terme | Diocese | |
| Chieti–Vasto | Metr. Archdiocese | United æque principaliter with Vasto 1982.08.24–1986.09.30 |
| Lanciano–Ortona | Archdiocese | United æque principaliter with Ortona 1945.11.24–1986.09.30 |
| Cosenza–Bisignano | Metr. Archdiocese | United æque principaliter with Bisignano 1979.04.04–1986.09.30 |
| Rossano–Cariati | Archdiocese | United æque principaliter with Cariati 1979.04.04–1986.09.30 |
| Cassano all’Jonio | Diocese | |
| San Marco Argentano–Scalea | Diocese | United æque principaliter with Bisignano 1818.06.27–1979.04.04 |
| Fermo | Metr. Archdiocese | |
| Camerino–San Severino Marche | Archdiocese | United æque principaliter with Fabriano 1728.11.15–1785.07.08 |
| Ascoli Piceno | Diocese | |
| Macerata | Diocese | United æque principaliter with Recanati 1356.01.08–1516.01.07, 1571–1586.03.17; united æque principaliter with Tolentino 1586.12.10–1986.09.30; united æque principaliter with Cingoli, Recanati and Treia 1985.01.25–1986.09.30 |
| San Benedetto del Tronto–Ripatransone–Montalto | Diocese | United with Montalto 1983.04.07–1986.09.30 |
| Firenze / Florence | Metr. Archdiocese | |
| Arezzo–Cortona–Sansepolcro | Diocese | |
| Fiesole | Diocese | |
| Pistoia | Diocese | United æque principaliter with Prato 1653.09.22–1954.01.25 |
| Prato | Diocese | United æque principaliter with Pistoia 1653.09.22–1954.01.25 |
| San Miniato | Diocese | |
| Foggia–Bovino | Metr. Archdiocese | United æque principaliter with Bovino and Troia 1974.12.14–1986.09.30 |
| Manfredonia–Vieste–San Giovanni Rotondo | Archdiocese | United æque principaliter with Benevento 663–1020 |
| Cerignola–Ascoli Satriano | Diocese | United æque principaliter with Ascoli Satriano 1819.06.14–1986.09.30 |
| Lucera–Troia | Diocese | United with Civitate 1439–1471 |
| San Severo | Diocese | |
| Genova / Genoa | Metr. Archdiocese | |
| Albenga–Imperia | Diocese | |
| Chiavari | Diocese | |
| La Spezia–Sarzana–Brugnato | Diocese | United æque principaliter with Luni–Sarzana 1929.01.12–1975.08.04, with Brugnato 1929.01.12–1986.09.30, with Sarzana 1975.08.04–1986.09.30 |
| Savona–Noli | Diocese | United æque principaliter with Noli 1502.01.04–1503, 1820.11.25–1986.09.30 |
| Tortona | Diocese | |
| Ventimiglia–San Remo | Diocese | |
| Gorizia | Metr. Archdiocese | |
| Trieste | Diocese |  United æque principaliter with Koper 1828.06.30–1977.10.17 |
| L’Aquila | Metr. Archdiocese | |
| Avezzano | Diocese | |
| Sulmona–Valva | Diocese | United æque principaliter with Valva 1053–1986.09.30 |
| Lecce | Metr. Archdiocese |  United æque principaliter with Alessano 1518.05.17–1521.06.03 |
| Brindisi–Ostuni | Archdiocese | |
| Otranto | Archdiocese | |
| Nardò–Gallipoli | Diocese | |
| Ugento–Santa Maria di Leuca | Diocese | |
| Messina–Lipari–Santa Lucia del Mela (–Santissimo Salvatore) | Metr. Archdiocese | United æque principaliter with Santissimo Salvatore (Italo-Albanese Rite) 1883.08.31–1986.09.30 |
| Nicosia | Diocese | |
| Patti | Diocese | United æque principaliter with Lipari 1157–1399.04.18 |
| Milano / Milan (Ambrosian Rite) | Metr. Archdiocese | |
| Bergamo | Diocese | |
| Brescia | Diocese | |
| Como | Diocese | |
| Crema | Diocese | |
| Cremona | Diocese | |
| Lodi | Diocese | |
| Mantova / Mantua | Diocese | |
| Pavia | Diocese | |
| Vigevano | Diocese | |
| Modena–Nonantola | Metr. Archdiocese | |
| Carpi | Diocese | |
| Fidenza | Diocese | |
| Parma (–Fontevivo) | Diocese | |
| Piacenza–Bobbio (–San Colombano) | Diocese | |
| Reggio Emilia–Guastalla | Diocese | |
| Napoli / Naples | Metr. Archdiocese | |
| Capua | Archdiocese | |
| Sorrento–Castellammare di Stabia | Archdiocese | |
| Acerra | Diocese | United æque principaliter with Sant’Agata de’ Goti 1818.06.27–1854.11.30 |
| Alife–Caiazzo | Diocese | United æque principaliter with Telese 1820.12.14–1852.07.06 |
| Aversa | Diocese | |
| Caserta | Diocese | |
| Ischia | Diocese | |
| Nola | Diocese | |
| Pozzuoli | Diocese | |
| Sessa Aurunca | Diocese | |
| Teano–Calvi | Diocese | United æque principaliter with Calvi 1818.06.27–1986.09.30 |
| Pompei / Pompeii / Beatissima Vergine Maria del Santissimo Rosario | Territorial Prelature | |
| Oristano | Metr. Archdiocese | |
| Ales–Terralba | Diocese | Ales united æque principaliter with Terralba 1503.12.08–1986.09.30 |
| Palermo | Metr. Archdiocese | United æque principaliter with Monreale 1775.07.07–1802.03.02 |
| Monreale | Archdiocese | United æque principaliter with Palermo 1775.07.07–1802.03.02 |
| Cefalù | Diocese | |
| Mazara del Vallo | Diocese | |
| Trapani | Diocese | |
| Perugia–Città della Pieve | Metr. Archdiocese | |
| Assisi–Nocera Umbra–Gualdo Tadino | Diocese | |
| Città di Castello | Diocese | |
| Foligno | Diocese | |
| Gubbio | Diocese | |
| Pesaro | Metr. Archdiocese | |
| Urbino–Urbania–Sant’Angelo in Vado | Archdiocese | |
| Fano–Fossombrone–Cagli–Pergola | Diocese | |
| Pescara–Penne | Metr. Archdiocese | United æque principaliter with Atri 1252.03.15–1949.07.01 |
| Teramo–Atri | Diocese | United æque principaliter with Atri 1949.07.01–1986.09.30 |
| Pisa | Metr. Archdiocese | |
| Livorno / Leghorn | Diocese | |
| Massa Carrara–Pontremoli | Diocese | |
| Pescia | Diocese | |
| Volterra | Diocese | |
| Potenza–Muro Lucano–Marsico Nuovo | Metr. Archdiocese | United æque principaliter with Marsico Nuovo 1818.06.27–1986.09.30 |
| Acerenza | Archdiocese | United æque principaliter with Matera 1203.05.07–1415, 1444.09.04–1818.06.27, 1822.11.09–1954.07.02 |
| Matera–Irsina (–San Michele Arcangelo di Montescaglioso) | Archdiocese | United æque principaliter with Acerenza 1203.05.07–1415, 1444.09.04–1818.06.27, 1822.11.09–1954.07.02. United æque principaliter with Irsina 1976.08.21–1986.09.30. |
| Melfi–Rapolla–Venosa | Diocese | United æque principaliter with Lavello 1070–1172, with Rapolla 1528.03.16–1986.09.30 |
| Tricarico | Diocese | |
| Tursi–Lagonegro | Diocese | |
| Ravenna–Cervia | Metr. Archdiocese | United æque principaliter with Cervia 1947.02.22–1986.09.30 |
| Cesena–Sarsina | Diocese | |
| Forlì–Bertinoro | Diocese | |
| Rimini | Diocese | |
| San Marino–Montefeltro | Diocese | Also covers San Marino  . |
| Reggio Calabria–Bova | Metr. Archdiocese | |
| Locri–Gerace (–Santa Maria di Polsi) | Diocese | United æque principaliter with Oppido Mamertina 1472–1536 |
| Mileto–Nicotera–Tropea | Diocese | |
| Oppido Mamertina–Palmi | Diocese | United æque principaliter with Gerace 1472–1536 |
| Salerno–Campagna–Acerno | Metr. Archdiocese | |
| Amalfi–Cava de’ Tirreni | Archdiocese | |
| Nocera Inferiore–Sarno | Diocese | |
| Teggiano–Policastro | Diocese | |
| Vallo della Lucania | Diocese | |
| Santissima Trinità di Cava de’ Tirreni | Territorial Abbacy | |
| Sassari | Metr. Archdiocese | |
| Alghero–Bosa | Diocese | |
| Ozieri | Diocese | |
| Tempio–Ampurias | Diocese | |
| Siena–Colle di Val d’Elsa–Montalcino | Metr. Archdiocese | |
| Grosseto | Diocese | |
| Massa Marittima–Piombino | Diocese | |
| Montepulciano–Chiusi–Pienza | Diocese | United æque principaliter with Pienza 1462–1528, 1535–1554, 1563–1599 |
| Pitigliano–Sovana–Orbetello | Diocese | |
| Siracusa / Syracuse | Metr. Archdiocese | |
| Noto | Diocese | |
| Ragusa | Diocese | |
| Taranto | Metr. Archdiocese | |
| Castellaneta | Diocese | |
| Oria | Diocese | |
| Torino / Turin | Metr. Archdiocese | |
| Acqui | Diocese | United æque principaliter with Alessandria 1213–1405.04.15 |
| Alba | Diocese | |
| Aosta / Aoste | Diocese | |
| Asti | Diocese | |
| Cuneo–Fossano | Diocese | |
| Ivrea | Diocese | |
| Mondovì / Mons Vici | Diocese | |
| Pinerolo | Diocese | |
| Saluzzo | Diocese | |
| Susa | Diocese |  |
| Trento / Trent | Metr. Archdiocese | |
| Bolzano–Bressanone / Bozen–Brixen / Bulsan–Persenon | Diocese | |
| Udine | Metr. Archdiocese | |
| Vercelli | Metr. Archdiocese | |
| Alessandria | Diocese | United æque principaliter with Acqui 1213–1405.04.15 |
| Biella | Diocese | |
| Casale Monferrato | Diocese | |
| Novara | Diocese | |
| Sui juris Jurisdictions (23) | Type | Churches and Bishops |
| Gaeta | Archdiocese | |
| Lucca | Archdiocese | |
| Spoleto–Norcia | Archdiocese | |
| Anagni–Alatri | Diocese | |
| Civita Castellana | Diocese | United æque principaliter with Orte 1437.10.05–1986.02.11, with Gallese 1805.12.20–1986.02.11 |
| Civitavecchia–Tarquinia | Diocese | United æque principaliter with Porto e Santa Rufina 1825.12.10–1854.06.14; united æque principaliter with Corneto 1854.06.14–1986.09.30 |
| Frosinone–Veroli–Ferentino | Diocese | |
| Latina–Terracina–Sezze–Priverno | Diocese | United æque principaliter with Priverno and Sezze 1217.01.17–1986.09.30 |
 Lungro (Italo-Albanese Rite) | Diocese |  |
| Orvieto–Todi | Diocese | |
| Piana degli Albanesi / Hora (Italo-Albanese Rite) | Diocese |  |
| Rieti (–San Salvatore Maggiore) | Diocese | |
| Sora–Cassino–Aquino–Pontecorvo | Diocese | United æque principaliter with Aquino and Pontecorvo 1818.06.27–1986.09.30 |
| Terni–Narni–Amelia | Diocese | United æque principaliter with Narni 1907.04.12–1986.09.30, with Amelia 1983.09.13–1986.09.30 |
| Tivoli | Diocese | |
| Viterbo (–San Martino al Monte Cimino) | Diocese | United æque principaliter with Tuscania 1192–1986, with San Martino al Monte Cimino 1936.05.02–1986.03.27 |
| Monte Oliveto Maggiore | Territorial Abbacy |  |
| Montecassino | Territorial Abbacy | United æque principaliter with Atina 1878–1977.03.21 |
 Santa Maria di Grottaferrata (Italo-Albanese Rite) | Territorial Abbacy |  |
| Subiaco | Territorial Abbacy | |
 Italy (Ukrainian Rite) | Apostolic Exarchate | |
 Ordinariato Militare per l’Italia | Military Ordinariate | |
| Opus Dei | Personal Prelature | |
