| Country | Origin | Kind/Order | Other Relevant Names | Earlier See or Co-Cathedral | Latin Name (adj.) |
|---|---|---|---|---|---|
| Ireland | Trim | Parish | |||
| Israel | Jerusalem | Patriarchate | Gerusalemme, Jeruzsálem | Hierosolymitanus | |
| Israel | OCarm | (OCarm) | Ordo Carmelitarum, Carmelites | Carmelitanus | |
| Israel | OMel | Ordo Melitensis, Sovereign Military Order of Malta, Ordo Equitum Hospitalarorum Sancti Ioannis de Ierusalem, Hospitallers | Melitensis | ||
| Iceland | Ísland | Country | Iceland, Izland | ||
| Italy | Abruzzo | Region | Abruzzi | Aprutianus | |
| Italy | Albaneta | Monastery (OSB) | Santa Maria dell'Albaneta | Sanctae Mariae in Albaneta | |
| Italy | Anagni | Episcopal see | Anagninus | ||
| Italy | Ancona | Anconitanus | |||
| Italy | Aosta | Episcopal see | Aoste | Augustensis | |
| Italy | Aquileia | Patriarchate | Aquileiensis | ||
| Italy | Arezzo | Episcopal see | Arretinus | ||
| Italy | Asciano | (OSB) | Abbazia di Monte Oliveto Maggiore, Abbatia Sanctae Mariae Montis Oliveti Maioris | ||
| Italy | Benevento | Archiepiscopal see | Beneviento | Beneventanus | |
| Italy | Benevento (OSB) | (OSB) | |||
| Italy | Bergamo | Pergamensis | |||
| Italy | Bobbio | (OSB) | |||
| Italy | Bologna | Bononiensis | |||
| Italy | Brescia | Episcopal see | Brixiensis | ||
| Italy | Brescia (OSB) | (OSB) | San Faustino | ||
| Italy | Bressanone | Episcopal see | Brixen | Brixinensis | |
| Italy | Cagliari | Archiepiscopal see | Casteddu | Calaritanus | |
| Italy | Calabria | ||||
| Italy | Candiana | (CRSA) | Monastero S. Michele Arcangelo | ||
| Italy | Capua | Archiepiscopal see | Capuanus | ||
| Italy | Cassino | Monastery (OSB) | Monte Cassino, Montecassino | Casinensis | |
| Italy | Castel San Vincenzo | (OSB) | Abbazia di San Vincenzo al Volturno | Vulturnensis | |
| Italy | Cava de' Tirreni | (OSB) | Santissima Trinità di Cava de' Tirreni | Cavensis | |
| Italy | Chieti | Episcopal see | Chiete, Θεάτη | Theatinus | |
| Italy | Citta di Castello | ||||
| Italy | Civate | (OSB) | Abbazia di San Pietro al Monte | ||
| Italy | Como | Episcopal see | Comensis | ||
| Italy | Cosenza | Archiepiscopal see | |||
| Italy | Cremona | Episcopal see | Cremùna, Carmona | Cremonensis | |
| Italy | ECMC | (ECMC) | Eremiti Camaldulenses Montis Coronae, Camaldolese Hermits | Camaldolensis | |
| Italy | Ferrara | Ferrariensis | |||
| Italy | Fiesole | (OSB) | Badia di Fiesole | Fesulanus | |
| Italy | Firenze | Archiepiscopal see | Florenz, Florence | Florentinus | |
| Italy | Foggia | (OSB) | Santa Cecilia | Fodianus | |
| Italy | Foligno | (OSB) | Abbazia di Sassovivo | ||
| Italy | Fonte Avellana | (OSB) | Venerable Hermitage of the Holy Cross, Serra Sant'Abbondio | ||
| Italy | Gorgona | Monastery (OSB) | |||
| Italy | Innichen | (OSB) | |||
| Italy | Isola di San Michele | (OSB) | Monastero di S. Michele di Murano | ||
| Italy | Italia | Country | Italy, Olaszország | ||
| Italy | Italy (Central) | ||||
| Italy | Italy (North) | ||||
| Italy | Italy (South) | ||||
| Italy | Ivrea | Eporediensis | |||
| Italy | Lodi | Episcopal see | Laudensis | ||
| Italy | Lombardia | Region | Lombardy | ||
| Italy | Lucca | Episcopal see | Lucensis | ||
| Italy | Messina | Archiepiscopal see | Messanensis, Gallicanus | ||
| Italy | Milano | Archiepiscopal see | Milan, Milánó, Mailand, Majland | Mediolanensis (Ambrosianus) | |
| Italy | Modena | Episcopal see | Mutinensis | ||
| Italy | Moggio Udinese | (OSB) | Abbazia di San Gallo | ||
| Italy | Monreale | Archiepiscopal see | Murriali | Montis Regalis | |
| Italy | Monza | Parish | Modoetiensis | ||
| Italy | Mortara | (CRSA) | |||
| Italy | Napoli | Archiepiscopal see | Napule, Naples, Nápoly | ||
| Italy | Napoli (OSB) | (OSB) | |||
| Italy | Narni | Narniensis | |||
| Italy | Nonantola | Monastery (OSB) | Modena | Nonantulanus | |
| Italy | Novacella | (CRSA) | Neustift | ||
| Italy | Novara | Novariensis | |||
| Italy | OCD | (OCD) | Ordo Carmelitarum Discalceatorum, Discalced Carmelites | Carmelitanus Discalciatus | |
| Italy | OFM | (OFM) | Ordo Fratrum Minorum, Franciscans | Franciscanus | |
| Italy | OHum | (OHum) | Ordo Humiliatorum, Humiliati | Humiliatorum | |
| Italy | OM | Ordo Minimorum, Minims | |||
| Italy | OSA | (OSA) | Ordo Sancti Augustini, Augustinian Hermits | Augustinianus (eremitarum) | |
| Italy | OSB | (OSB) | Ordo Sancti Benedicti, Benedictines | Benedictinus | |
| Italy | Ostia | Episcopal see | Ostia Antica | Velletri | Ostiensis |
| Italy | Oulx | Episcopal see | Ors | Susa | Segusiensis |
| Italy | Padova | Padua | Patavinus | ||
| Italy | Padova, Santa Giustina | Monastery (OSB) | Sanctae Iustinae Patavinae | ||
| Italy | Palermo | Archiepiscopal see | Panormitanus | ||
| Italy | Pavia | Episcopal see | Ticinum | Papiensis | |
| Italy | Perugia | Episcopal see | Perusinus | ||
| Italy | Perugia (OSB) | (OSB) | |||
| Italy | Piacenza | Episcopal see | Placentinus | ||
| Italy | Pisa | Monastery (OSB) | Pisanus | ||
| Italy | Pistoia | Episcopal see | Pistoriensis | ||
| Italy | Poggibonsi | (OSB) | Abbazia di San Michele Arcangelo a Marturi, Castello della Badia | ||
| Italy | Pontida | (OSB) | Monastero San Giacomo Maggiore | ||
| Italy | Ravenna | Archiepiscopal see | Ravennatensis | ||
| Italy | Ravenna (OSB) | (OSB) | SS. Gervasio e Protasio | ||
| Italy | Rieti | Reatinus | |||
| Italy | Roma | Patriarchate | Rome, Róma | Romanus | |
| Italy | Salerno | Archiepiscopal see | Salernitanum | ||
| Italy | San Benedetto Po | (OSB) | Abbazia di San Benedetto in Polirone | ||
| Italy | Santa Margherita Ligure | (OSB) | Abbazia della Cervara | ||
| Italy | Sicila | Sicily, Szicília | |||
| Italy | Siena | Archiepiscopal see | Senensis | ||
| Italy | Siracusa | Episcopal see | Sarausa, Seragusa, Συρακοῦσαι, Syracuse, Szirakúza | Syracusanus | |
| Italy | Sora | Episcopal see | Soranus | ||
| Italy | Sorrento | Archiepiscopal see | |||
| Italy | Spoleto | Episcopal see | Spoletanus | ||
| Italy | Subiaco | (OSB) | Abbazia territoriale di Subiaco | Sublacensis | |
| Italy | Teolo | (OSB) | Abbazia di Praglia | ||
| Italy | Toscana | Tuscany |