 | 1843 | 1844 | 1845 |  |
Date | Country | Change |
| 1844 |  Micronesia | Apostolic Prefecture of Micronesia was established (from Apostolic Vicariate of New Zealand) |
| 1844.01.11 |  Italy | Diocese of Sovana was renamed as Diocese of Sovana–Pitigliano |
| 1844.03.02 |  China | Apostolic Vicariate of Honan 河南 was established (from Diocese of Nanjing 南京) |
| 1844.03.02 | China | Apostolic Vicariate of Shaanxi and Shanxi 陝西山西 was renamed as Apostolic Vicariate of Shaanxi 陝西 (lost territory to establish Apostolic Vicariate of Shanxi 山西) |
| 1844.03.02 | China | Apostolic Vicariate of Shanxi 山西 was restored (from Apostolic Vicariate of Shaanxi and Shanxi 陝西山西) |
| 1844.03.02 |  Vietnam | Apostolic Vicariate of Cochin was renamed as Apostolic Vicariate of Eastern Cochin (lost territory to establish Apostolic Vicariate of Western Cochin) |
| 1844.03.02 | Vietnam | Apostolic Vicariate of Western Cochin was established (from Apostolic Vicariate of Cochin) |
| 1844.04.16 |  Canada | Apostolic Vicariate of North West was established (from Archdiocese of Québec) |
| 1844.05.15 | Italy | Diocese of Noto was established (from Diocese of Siracusa) |
| 1844.05.20 | Italy | Diocese of Agrigento lost territory to Metropolitan Archdiocese of Monreale |
| 1844.05.20 | Italy | Diocese of Caltagirone exchanged territory with Diocese of Piazza Armerina |
| 1844.05.20 | Italy | Diocese of Catania lost territory to Diocese of Caltagirone |
| 1844.05.20 | Italy | Diocese of Cefalù exchanged territory with Metropolitan Archdiocese of Palermo and Diocese of Patti |
| 1844.05.20 | Italy | Diocese of Mazara del Vallo lost territory to Metropolitan Archdiocese of Monreale |
| 1844.05.20 | Italy | Diocese of Nicosia lost territory to Diocese of Patti and Diocese of Piazza Armerina |
| 1844.05.20 | Italy | Metropolitan Archdiocese of Palermo exchanged territory with Diocese of Cefalù |
| 1844.05.20 | Italy | Diocese of Patti exchanged territory with Diocese of Cefalù |
| 1844.05.20 | Italy | Diocese of Piazza Armerina exchanged territory with Diocese of Caltagirone |
| 1844.05.20 | Italy | Diocese of Siracusa was promoted as Metropolitan Archdiocese of Siracusa (with suffragan sees Caltagirone, Noto and Piazza Armerina and lost territory to Diocese of Piazza Armerina) |
| 1844.05.25 | Italy | Diocese of Caltanissetta was established (from Diocese of Agrigento, Diocese of Cefalù and Diocese of Nicosia and became suffragan of Monreale) |
| 1844.05.31 | Italy | Diocese of Trapani was established (from Diocese of Mazara del Vallo and became suffragan of Palermo) |
| 1844.07.12 | Canada | Archdiocese of Québec was promoted as Metropolitan Archdiocese of Québec (with suffragan sees Charlottetown, Halifax, Kingston, Montréal, Saint John in America and Toronto) |
| 1844.07.16 |  Papua New Guinea | Apostolic Vicariate of Melanesia was established (from Apostolic Vicariate of New Zealand) |
| 1844.08.13 |  French Polynesia | Apostolic Prefecture of Southern Oceania was suppressed (to Apostolic Vicariate of Eastern Oceania) |
| 1844.08.13 |  USA | Apostolic Prefecture of Sandwich Islands was promoted as Apostolic Vicariate of Sandwich Islands |
| 1844.09.22 | Canada | Diocese of Arichat was established (from Diocese of Halifax and became suffragan of Québec) |
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