 | 1802 | 1803 | 1804 |  |
Date | Country | Change |
| 1803 |  Austria | Metropolitan Archdiocese of Salzburg lost territory to Diocese of Brixen |
| 1803 |  Germany | Provostry nullius of Berchtesgaden was suppressed (to Metropolitan Archdiocese of Salzburg) |
| 1803 | Germany | Diocese of Freising was suppressed (to Metropolitan Archdiocese of Salzburg and Diocese of Brixen) |
| 1803 |  Italy | Diocese of Bertinoro was suppressed (to Metropolitan Archdiocese of Ravenna) |
| 1803 | Italy | Diocese of Brugnato lost territory to Diocese of Ajaccio |
| 1803 | Italy | Archdiocese of Ferrara was promoted as Metropolitan Archdiocese of Ferrara (with suffragan sees Adria, Comacchio, Mantova and Verona) |
| 1803 | Italy | Metropolitan Archdiocese of Genova lost territory to Diocese of Ajaccio |
| 1803 | Italy | Diocese of Grosseto lost territory to Diocese of Ajaccio |
| 1803 | Italy | Diocese of Massa Marittima e Populonia lost territory to Diocese of Ajaccio |
| 1803 |  Spain,  Andorra | Diocese of Urgell lost territory to Diocese of Carcassonne |
| 1803.02.25 |  France | Diocese of Strasbourg lost territory to Diocese of Konstanz |
| 1803.03.09 | Italy | Diocese of Bisarcio was restored (from Metropolitan Archdiocese of Sassari and Diocese of Alghero and became suffragan of Sassari) |
| 1803.03.09 | Italy | Diocese of Bosa lost territory to Diocese of Alghero |
| 1803.03.09 | Italy | Metropolitan Archdiocese of Oristano lost territory to Diocese of Bosa |
| 1803.03.22 |  Netherlands | Apostolic Vicariate of Breda was established (from Diocese of Gent and Apostolic Vicariate of ’s-Hertogenbosch) |
| 1803.03.22 | Netherlands | Apostolic Vicariate of Ravenstein–Megen was established (from Diocese of Liège) |
| 1803.05.28 |  Peru | Diocese of Maynas was established (from Metropolitan Archdiocese of Lima, Diocese of Cuenca, Diocese of Huamanga, Diocese of Popayán, Diocese of Quito and Diocese of Trujillo and became suffragan of Lima) |
| 1803.06.01 | Italy | Diocese of Alba was suppressed (to Diocese of Asti) |
| 1803.06.01 | Italy | Diocese of Alessandria was suppressed (to Diocese of Casale Monferrato) |
| 1803.06.01 | Italy | Diocese of Aosta was suppressed (to Diocese of Ivrea) |
| 1803.06.01 | Italy | Diocese of Biella was suppressed (to Diocese of Vercelli) |
| 1803.06.01 | Italy | Diocese of Bobbio was suppressed (to Diocese of Casale Monferrato) |
| 1803.06.01 | Italy | Diocese of Pinerolo was suppressed (to Diocese of Saluzzo) |
| 1803.06.01 | Italy | Diocese of Susa was suppressed (to Metropolitan Archdiocese of Torino) |
| 1803.06.01 | Italy | Diocese of Tortona was suppressed (to Diocese of Casale Monferrato) |
| 1803.06.07 | Italy | Abbacy nullius of Sacra di San Michele was suppressed (to Metropolitan Archdiocese of Torino) |
| 1803.09.01 | Italy | Diocese of Albenga lost territory to Diocese of Mondovì |
| 1803.11.24 |  Cuba | Diocese of Santiago was promoted as Metropolitan Archdiocese of Santiago (with suffragan sees La Habana and Puerto Rico) |
| 1803.11.24 |  Venezuela | Diocese of Caracas was promoted as Metropolitan Archdiocese of Caracas (with suffragan sees Mérida and Santo Tomás de Guayana) |
© 2026 GCatholic.org
|
