 | 1855 | 1856 | 1857 |  |
Date | Country | Change |
| 1856 |  Myanmar | Apostolic Vicariate of Ava and Pegu was renamed as Apostolic Vicariate of Burma |
| 1856.01.21 |  China | Diocese of Nanjing 南京 was demoted as Apostolic Vicariate of Jiangnan 江南 (without ecclesiastical province) |
| 1856.02.29 |  Canada | Diocese of Hamilton was established (from Diocese of Toronto and became suffragan of Québec) |
| 1856.02.29 | Canada | Diocese of Harbour Grace was established (from Diocese of Newfoundland and without ecclesiastical province) |
| 1856.02.29 | Canada | Diocese of Newfoundland was renamed as Diocese of Saint John’s, Newfoundland (lost territory to establish Diocese of Harbour Grace) |
| 1856.04.02 | China | Apostolic Vicariate of Eastern Szechwan 四川東境 was established (from Apostolic Vicariate of Szechwan 四川) |
| 1856.04.02 | China | Apostolic Vicariate of Szechwan 四川 was renamed as Apostolic Vicariate of Northwestern Szechwan 四川西北 (lost territory to establish Apostolic Vicariate of Eastern Szechwan 四川東境) |
| 1856.04.08 | China | Apostolic Vicariate of Hunan 湖南 was established (from Apostolic Vicariate of Hupeh and Hunan 湖廣) |
| 1856.04.08 | China | Apostolic Vicariate of Hupeh and Hunan 湖廣 was renamed as Apostolic Vicariate of Hupeh 湖北 (lost territory to establish Apostolic Vicariate of Hunan 湖南) |
| 1856.05.30 | China | Diocese of Beijing 北京 was demoted as Apostolic Vicariate of Northern Chi-Li 直隸北境 (lost territory to establish Apostolic Vicariate of Southeastern Chi-Li 直隸東南 and Apostolic Vicariate of Southwestern Chi-Li 直隸西南 and without ecclesiastical province) |
| 1856.05.30 | China | Apostolic Vicariate of Southeastern Chi-Li 直隸東南 was established (from Diocese of Beijing 北京) |
| 1856.05.30 | China | Apostolic Vicariate of Southwestern Chi-Li 直隸西南 was established (from Diocese of Beijing 北京) |
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