| Date | From | To |
|---|
| unknown | | | Fils de Marie Immaculée
| Founded |
| unknown | | | Institute of Charity
| Founded |
| 4 May | Diocese of Brėst (Ukrainian)
Diocese of Vilno (Ukrainian), Lithuania
| Territory Lost | Diocese of Žyrovyci (Ukrainian), Lithuania
| Erected |
| 4 May | Diocese of Lutzk e Ostrog (Ukrainian), Ukraine
| Suppressed | Archdiocese of Połock (Polotsk) (Ukrainian), Belarus
| Territory Added |
| 13 Jun | Diocese of Soissons, France
| Name Changed | Diocese of Soissons (-Laon), France
| Name Changed |
| 30 Jun | Archdiocese of Dubrovnik (Ragusa), Croatia
| Elevated | Diocese of Dubrovnik (Ragusa), Croatia (Archdiocese to Diocese)
| Elevated |
| 30 Jun | Diocese of Poreč (Parenzo), Croatia
Diocese of Pula (Pola), Croatia
| United | Diocese of Poreč i Pula, Croatia
| United |
| 30 Jun | Diocese of Makarska, Croatia
Archdiocese of Split (Spalato), Croatia
| United | Diocese of Split-Makarska (Spalato-Macarska), Croatia
| United |
| 30 Jun | Diocese of Capodistria (Capo d’Istria)(Koper), Slovenia
Diocese of Trieste, Italy
| United | Diocese of Trieste e Capodistria (Trst i Koper), Italy
| United |
| 30 Jun | Diocese of Korčula (Curzola, Cursola), Croatia
Diocese of Stagno (Ston), Croatia
| Suppressed | Archdiocese of Dubrovnik (Ragusa), Croatia
| Territory Added |
| 30 Jun | Diocese of Nona (Nin), Croatia
| Suppressed |
| 30 Jun | Diocese of Budua (Budva), Montenegro
| Suppressed | Diocese of Kotor (Cattaro), Montenegro
| Territory Added |
| 30 Jun | Diocese of Arbe (Rab), Croatia
Diocese of Ossero (Osor), Croatia
| Suppressed | Diocese of Krk (Veglia), Croatia
| Territory Added |
| 30 Jun | Diocese of Novigrad (Cittanova), Croatia
| Suppressed | Diocese of Trieste e Capodistria (Trst i Koper), Italy
| Territory Added |
| 30 Jun | Diocese of Knin (Tinin), Croatia
Diocese of Trogir (Traù), Croatia
| Suppressed | Diocese of Šibenik (Knin), Croatia
| Territory Added |
| 13 Sep | | | Diocese of Guastalla, Italy
| Erected |
| 22 Sep | Archdiocese of Trani e Bisceglie, Italy
| Name Changed | Archdiocese of Trani e Nazareth e Bisceglie, Italy
| Name Changed |
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