 | 1840 | 1841 | 1842 |  |
Date | Country | Change |
| 1841 |  Madagascar | Apostolic Prefecture of Madagascar was established (from Apostolic Prefecture of Bourbon) |
| 1841 |  Switzerland | Diocese of Chur lost territory to Diocese of Basel |
| 1841 |  United Arab Emirates,  Oman,  Yemen | Apostolic Prefecture of Jedda was renamed as Apostolic Prefecture of Aden |
| 1841.02.13 |  USA | Diocese of Bardstown was suppressed (to establish Diocese of Louisville) |
| 1841.02.13 | USA | Diocese of Louisville was established (from the suppressed Diocese of Bardstown and became suffragan of Baltimore) |
| 1841.03.04 |  Belgium | Diocese of Gent lost territory to Apostolic Vicariate of Breda |
| 1841.04.03 |  Indonesia | Apostolic Prefecture of Batavia was promoted as Apostolic Vicariate of Batavia |
| 1841.04.22 |  Hong Kong | Apostolic Prefecture of Hong Kong 香港 was established (from Diocese of Macau 澳門) |
| 1841.07.10 | USA | Apostolic Prefecture of Texas was promoted as Apostolic Vicariate of Texas |
| 1841.09.10 |  Malaysia | Apostolic Vicariate of Western Siam was restored (from Apostolic Vicariate of Siam) |
| 1841.09.10 |  Thailand | Apostolic Vicariate of Siam was renamed as Apostolic Vicariate of Eastern Siam (lost territory to establish Apostolic Vicariate of Western Siam) |
| 1841.10.01 |  France | Diocese of Cambrai was promoted as Metropolitan Archdiocese of Cambrai (with suffragan see Arras) |
| 1841.11.25 |  Italy | Abbacy nullius of Farfa was suppressed (to Diocese of Rieti and to establish Diocese of Poggio Mirteto) |
| 1841.11.25 | Italy | Diocese of Poggio Mirteto was established (from Diocese of Rieti and Diocese of Sabina and from the suppressed Abbacy nullius of Farfa and Abbacy nullius of San Salvatore Maggiore) |
| 1841.11.25 | Italy | Diocese of Sabina lost territory to Diocese of Narni and Diocese of Tivoli |
| 1841.11.25 | Italy | Abbacy nullius of San Salvatore Maggiore was suppressed (to Diocese of Rieti and to establish Diocese of Poggio Mirteto) |
| 1841.12.17 |  Canada | Diocese of Toronto was established (from Diocese of Kingston) |
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