| Date | Country | Change |
| 1824 | Diocese of Andros was suppressed (to Diocese of Tinos–Mykonos) | |
| 1824 | Metropolitan Archdiocese of Messina lost territory to Diocese of Patti | |
| 1824.03.26 | Diocese of Hildesheim exchanged territory with Diocese of Osnabrück | |
| 1824.03.26 | Diocese of Mainz lost territory to Diocese of Hildesheim | |
| 1824.03.26 | Apostolic Vicariate of Nordic Missions lost territory to Diocese of Hildesheim and Diocese of Osnabrück | |
| 1824.03.26 | Diocese of Osnabrück exchanged territory with Diocese of Hildesheim | |
| 1824.08.15 | Titular Patriarchal See of Alexandria (Coptic Rite) was established | |
| 1824.11.08 | Diocese of Ogliastra was established (from Metropolitan Archdiocese of Cagliari and became suffragan of Cagliari) |
© 2026 GCatholic.org