| Date | From | To | ||
|---|---|---|---|---|
| unknown | Prefecture Apostolic of Islands of the Indian Ocean, Réunion | Elevated | Prefecture Apostolic of Bourbon, Réunion | Elevated |
| unknown | Diocese of Wigry, Poland | Suppressed | Diocese of Sejny o Sejna o Augustów, 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 | 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 München 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 München 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 |
| 1 May | Territorial Prelature of Asola, Italy | Suppressed | Diocese of Brescia, Italy (2 Parishes)
Diocese of Mantova, Italy (8 Parishes) | Territory Added |
| 1 May | Diocese of Caorle, Italy
Diocese of Torcello (Turris), Italy | Suppressed | Patriarchate of Venezia {Venice}, Italy | Territory Added |
| 1 May | Diocese of Adria, Italy (from Ravena to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Padova {Padua}, Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Vicenza, Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Verona, Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Treviso, Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Ceneda, Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Concordia (Sagittaria), Italy (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Capodistria (Capo d’Istria)(Koper), Slovenia (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Novigrad (Cittanova), Croatia (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Poreč (Parenzo), Croatia (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Diocese of Pula (Pola), Croatia (from Udine to Venezia) | Metropolitan Changed | ||
| 1 May | Patriarchate of Venezia {Venice}, Italy (Grado) | Territory Lost | Archdiocese of Gorizia e Gradisca, Italy | Territory Added |
| 1 May | Patriarchate of Venezia {Venice}, Italy (Latisana) | Territory Lost | Diocese of Udine, Italy | Territory Added |
| 1 May | Patriarchate of Venezia {Venice}, Italy (San Vendemiano, Bibano, Pianzano, Zoppč, San Fior di Sotto, and San Fior di Sopra) | Territory Lost | Diocese of Ceneda, Italy | Territory Added |
| 1 May | Archdiocese of Udine, Italy (Aviano, Sesto, Corbolone, Bando di Saletto, Cimolais, Claut, Erto, and Torrate) | Territory Lost | Diocese of Concordia (Sagittaria), Italy | Territory Added |
| 1 May | Archdiocese of Udine, Italy (San Cassiano del Meschio, Ceneva, Rugolo, Pinidello, Castello Roganzuolo, Godega, Orsago, and San Polo) | Territory Lost | Diocese of Ceneda, Italy | Territory Added |
| 1 May | Archdiocese of Udine, Italy (Moniego) | Territory Lost | Diocese of Treviso, Italy | Territory Added |
| 1 May | Archdiocese of Udine, Italy (Belvedere (a hamlet of Aquileia), Bergogna, Brazzano, Campolongo, Muscoli, Perteole, Pradizziolo (a hamlet of Cervignano del Friuli), Scodovacca, Strassoldo, Monfalcone, San Canziano, San Pier d'Isonzo, and Ronchi di Monfalcone) | Territory Lost | Archdiocese of Gorizia e Gradisca, Italy | Territory Added |
| 1 May | Diocese of Concordia (Sagittaria), Italy (Turrida) | Territory Lost | Diocese of Udine, Italy | Territory Added |
| 1 May | Archdiocese of Gorizia e Gradisca, Italy (Driolassa, Precenicco, Rivarotta, Campomolle, Flambruzzo, Porpetto, Gonars, Ontagnano, Torre di Zuino, and Carlino) | Territory Lost | Diocese of Udine, Italy | Territory Added |
| 1 May | Diocese of Vicenza, Italy (Villa del Conte, Sant'Anna Morosina, Onara, Cittadella, Rossano, Lozzo, and Selvazzano) | Territory Lost | Diocese of Padova {Padua}, Italy | Territory Added |
| 1 May | Diocese of Padova {Padua}, Italy (Friola, Schiavon, Breganze, Mason, Villaraspa, Pianezze san Cristoforo, Pianezze San Lorenzo, Molvena, Marostica, and Nove) | Territory Lost | Diocese of Vicenza, Italy | Territory Added |
| 1 May | Diocese of Verona, Italy (Santa Maria di Cinto) | Territory Lost | Diocese of Padova {Padua}, Italy | Territory Added |
| 1 May | Diocese of Feltre, Italy (Primolano) | Territory Lost | Diocese of Padova {Padua}, Italy | Territory Added |
| 1 May | Diocese of Adria, Italy (Barbona) | Territory Lost | Diocese of Padova {Padua}, Italy | Territory Added |
| 1 May | Diocese of Udine, Italy (Aviano, Sesto, Corbolone, Bando di Saletto, Cimolais, Claut, Erto, and Torrate) | Territory Lost | Diocese of Concordia (Sagittaria), Italy | Territory Added |
| 1 May | Diocese of Belluno, Italy (Mussolente and Casoni) | Territory Lost | Diocese of Treviso, Italy | Territory Added |
| 1 May | Diocese of Adria, Italy (6 Parishes) | Territory Lost | Archdiocese of Ferrara, Italy | Territory Added |
| 1 May | Archdiocese of Ravenna, Italy (Crespino and Sant'Apollinare) | Territory Lost | Diocese of Adria, Italy | Territory Added |
| 1 May | Archdiocese of Ferrara, Italy (Fiesso and Pissatola) | Territory Lost | Diocese of Adria, Italy | Territory Added |
| 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 Cittą 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 Janów Podlaski (Podlaska o Janów), Poland | Erected | ||
| 30 Jun | Diocese of Kielce, Poland | Suppressed | ||
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