 | 1850 | 1851 | 1852 |  |
Date | Country | Change |
| 1851 |  Canada | Diocese of North West was renamed as Diocese of Saint-Boniface |
| 1851 |  Egypt | Apostolic Vicariate of Egypt and Arabia was renamed as Apostolic Vicariate of Egypt |
| 1851 |  Netherlands | Apostolic Vicariate of Grave–Nijmegen was suppressed (to Apostolic Vicariate of ’s-Hertogenbosch) |
| 1851 |  Spain | Diocese of Algeciras was suppressed (to Diocese of Cádiz) |
| 1851 | Spain | Diocese of Guadix–Baza was renamed as Diocese of Guadix |
| 1851 | Spain | Diocese of Ibiza was suppressed (to Diocese of Mallorca) |
| 1851.05.20 |  India | Apostolic Vicariate of Hyderabad was established (from Apostolic Vicariate of Madras) |
| 1851.06.27 |  England | Diocese of Salford lost territory to Diocese of Liverpool |
| 1851.07.16 |  Italy | Diocese of Capaccio was renamed as Diocese of Capaccio–Vallo |
| 1851.09.05 | Spain | Diocese of Pamplona was renamed as Diocese of Pamplona–Tudela (gained territory from the suppressed Diocese of Tudela) |
| 1851.09.05 | Spain | Diocese of Tudela was suppressed (to Diocese of Pamplona–Tudela) |
| 1851.12.21 |  USA | Diocese of Monterey lost territory to Metropolitan Archdiocese of México |
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