 | 1856 | 1857 | 1858 |  |
Date | Country | Change |
| 1857.01.06 |  USA | Apostolic Vicariate of Indian Territory East of the Rocky Mountains was renamed as Apostolic Vicariate of Kansas (lost territory to establish Apostolic Vicariate of Nebraska) |
| 1857.01.06 | USA | Apostolic Vicariate of Nebraska was established (from Apostolic Vicariate of Indian Territory East of the Rocky Mountains) |
| 1857.01.08 | USA | Diocese of Fort Wayne was established (from Diocese of Vincennes and became suffragan of Cincinnati) |
| 1857.01.09 | USA | Diocese of Alton was established (from the suppressed Diocese of Quincy and became suffragan of Baltimore) |
| 1857.01.09 | USA | Apostolic Vicariate of Florida was established (from Diocese of Savannah) |
| 1857.01.09 | USA | Diocese of Quincy was suppressed (to establish Diocese of Alton) |
| 1857.01.09 | USA | Apostolic Vicariate of Upper Michigan was promoted as Diocese of Sault Sainte Marie (became suffragan of Cincinnati) |
| 1857.05.20 |  Austria | Diocese of Lavant lost territory to Diocese of Gurk |
| 1857.06.03 |  France | Diocese of Aire was renamed as Diocese of Aire et Dax |
| 1857.07.04 |  Spain | Diocese of Valladolid was promoted as Metropolitan Archdiocese of Valladolid (with suffragan sees Astorga, Ávila, Ciudad Rodrigo, Salamanca, Segovia and Zamora) |
| 1857.11.26 | Austria | Diocese of Leoben was suppressed (to Diocese of Seckau) |
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