| Date | From | To | ||
|---|---|---|---|---|
| unknown | Prefecture Apostolic of Islands of the Indian Ocean, R騏nion | Elevated | Prefecture Apostolic of Bourbon, R騏nion | Elevated |
| unknown | Diocese of Wigry, Poland | Suppressed | Diocese of Sejny o Sejna o August?w, Poland | Territory Added |
| unknown | Diocese of Belcastro, Italy
Diocese of Strongoli, Italy Diocese of Umbriatico (Umbriaticum), Italy | Suppressed | Archdiocese of Santa Severina, Italy | Territory Added |
| unknown | Diocese of Teramo, Italy | Territory Added | ||
| unknown | Diocese of Cariati e Cerenzia, Italy | Name Changed | Diocese of Cariati, Italy
Archdiocese of Santa Severina, Italy | Territory Added |
| unknown | Diocese of Torcello (Turris), Italy | Suppressed | Patriarchate of Venezia {Venice}, Italy | Territory Added |
| unknown | Vicariate Apostolic of Moldavia | Erected | ||
| unknown | Franciscan Brothers of the Third Order Regular, Mountbellow | Founded | ||
| 23 Feb | Diocese of Guayana, Venezuela | Territory Lost | Vicariate Apostolic of Trinidad, Trinidad and Tobago, Antilles | Erected |
| 18 Mar | Vicariate Apostolic of Smirne, Turkey | Elevated | Archdiocese of Izmir (Smirne), Turkey | Elevated |
| 1 Apr | Diocese of Bamberg, Germany | Elevated | Archdiocese of Bamberg, Germany | Elevated |
| 1 Apr | Diocese of Freising, Germany | Elevated | Archdiocese of M?nchen und Freising {Munich}, Germany | Elevated |
| 1 Apr | Diocese of Konstanz {Constance}, Germany | Territory Lost | Diocese of Augsburg, Germany
Diocese of Brixen {Bressanone}, Italy | Territory Added |
| 1 Apr | Diocese of Chiemsee, Germany | Suppressed | Archdiocese of M?nchen und Freising {Munich}, Germany
Archdiocese of Salzburg, Austria | Territory Added |
| 1 Apr | Diocese of Speyer, Germany (from Mainz to Bamberg) | Metropolitan Changed | ||
| 1 May | Diocese of Belluno, Italy
Diocese of Feltre, Italy | United | Diocese of Belluno e Feltre, Italy | United |
| 1 May | Archdiocese of Udine, Italy | Elevated | Diocese of Udine, Italy (Archdiocese to Diocese) | Elevated |
| 2 May | Diocese of Konstanz {Constance}, Germany | Territory Lost | Diocese of Basel, Switzerland
Diocese of Chur, Switzerland | Territory Added |
| 18 Jun | Vicariate Apostolic of Cape of Good Hope {Capo de Buona Speranza}, South Africa | Erected | ||
| 27 Jun | Diocese of Bitonto, Italy
Diocese of Ruvo (Ruo)(di Puglia), Italy | United | Diocese of Ruvo e Bitonto, Italy | United |
| 27 Jun | Diocese of Bisignano, Italy
Diocese of San Marco (Argentano), Italy | United | Diocese of San Marco e Bisignano, Italy | United |
| 27 Jun | Archdiocese of Manfredonia, Italy
Diocese of Vieste, Italy | United | Archdiocese of Manfredonia (e Vieste), Italy | United |
| 27 Jun | Diocese of Nicotera, Italy
Diocese of Tropea, Italy | United | Diocese of Nicotera e Tropea, Italy | United |
| 27 Jun | Diocese of Cava (de’ Tirreni), Italy
Diocese of Sarno, Italy | United | Diocese of Cava e Sarno, Italy | United |
| 27 Jun | Diocese of Marsico Nuovo, Italy
Diocese of Potenza, Italy | United | Diocese of Potenza e Marsico Nuovo, Italy | United |
| 27 Jun | Archdiocese of Conza, Italy
Diocese of Satriano e Campagna, Italy | United | Archdiocese of Conza e Campagna, Italy | United |
| 27 Jun | Diocese of Acerno, Italy
Archdiocese of Salerno, Italy | United | Archdiocese of Salerno (-Acerno), Italy | United |
| 27 Jun | Diocese of Aquino e Pontecorvo, Italy
Diocese of Sora, Italy | United | Diocese of Aquino, Sora, e Pontecorvo, Italy | United |
| 27 Jun | Diocese of Calvi Risorta, Italy
Diocese of Teano, Italy | United | Diocese of Calvi e Teano, Italy | United |
| 27 Jun | Diocese of Bisceglie, Italy
Archdiocese of Trani, Italy | United | Archdiocese of Trani e Bisceglie, Italy | United |
| 27 Jun | Archdiocese of Acerenza e Matera, Italy | Name Changed | Archdiocese of Acerenza (e Matera), Italy | Name Changed |
| 27 Jun | Diocese of Gravina (di Puglia), Italy
Diocese of Montepeloso, Italy | United | Diocese of Gravina e Irsina (Montepeloso), Italy | United |
| 27 Jun | Diocese of Avellino e Frigento, Italy | Name Changed | Diocese of Avellino, Italy | Name Changed |
| 27 Jun | Diocese of Bitetto, Italy | Suppressed | ||
| 27 Jun | Diocese of Castro di Puglia, Italy | Suppressed | Archdiocese of Otranto, Italy | Territory Added |
| 27 Jun | Diocese of Isola, Italy | Suppressed | Diocese of Crotone (Cotrone), Italy | Territory Added |
| 27 Jun | Diocese of Citt? Ducale, Italy | Suppressed | Diocese of L’Aquila, Italy | Territory Added |
| 27 Jun | Diocese of Capri, Italy
Diocese of Massa Lubrense, Italy Diocese of Vico Equense, Italy | Suppressed | Archdiocese of Sorrento, Italy | Territory Added |
| 27 Jun | Diocese of Minori, Italy
Diocese of Ravello e Scala, Italy | Suppressed | Archdiocese of Amalfi, Italy | Territory Added |
| 27 Jun | Diocese of Vulturara e Montecorvino, Italy | Suppressed | Diocese of Lucera, Italy | Territory Added |
| 27 Jun | Diocese of Minervino Murge, Italy | Suppressed | Diocese of Andria, Italy | Territory Added |
| 27 Jun | Diocese of Mottola (Motula), Italy | Suppressed | Diocese of Castellaneta, Italy | Territory Added |
| 27 Jun | Diocese of Martirano (Martoranum), Italy | Suppressed | Diocese of Nicastro, Italy | Territory Added |
| 27 Jun | Diocese of Montemarano, Italy | Suppressed | Diocese of Nusco, Italy | Territory Added |
| 27 Jun | Diocese of Monteverde, Italy | Suppressed | Diocese of Sant’Angelo dei Lombardi e Bisaccia, Italy | Territory Added |
| 27 Jun | Diocese of Carinola (Calina), Italy | Suppressed | Diocese of Sessa Aurunca, Italy | Territory Added |
| 27 Jun | Diocese of Fondi (Fundi), Italy | Suppressed | Diocese of Gaeta, Italy | Territory Added |
| 27 Jun | Diocese of Guardialfiera (Guardia), Italy | Suppressed | Diocese of Termoli, Italy | Territory Added |
| 27 Jun | Diocese of Polignano (Polinianum), Italy | Suppressed | Diocese of Monopoli, Italy | Territory Added |
| 28 Jun | Diocese of Alessano, Italy | Suppressed | Diocese of Ugento, Italy | Territory Added |
| 30 Jun | Diocese of Sandomierz, Poland | Erected | ||
| 30 Jun | Diocese of Warszawa, Poland | Elevated | Archdiocese of Warszawa {Warsaw}, Poland | Elevated |
| 30 Jun | Diocese of Jan?w Podlaski (Podlaska o Jan?w), Poland | Erected | ||
| 30 Jun | Diocese of Kielce, Poland | Suppressed | ||
| 22 Sep | Eparchy of Mukachevo (Munk當s) (Ruthenian), Ukraine | Territory Lost | Eparchy of Prešov (Prjašev, Eperjes) (Slovak), Slovakia | Erected |
| 21 Dec | Diocese of Lettere (-Gragnano), Italy | Suppressed | Diocese of Castellammare di Stabia, Italy | Territory Added |
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