 | 1911 | 1912 | 1913 |  |
Date | Country | Change |
| 1912 |  India | Metropolitan Archdiocese of Calcutta lost territory to Apostolic Vicariate of Tibet 西藏 |
| 1912 |  Peru | Diocese of Cajamarca exchanged territory with Diocese of Trujillo |
| 1912 | Peru | Diocese of Trujillo exchanged territory with Diocese of Cajamarca |
| 1912.03.08 |  USA | Diocese of Kearney was established (from Diocese of Omaha and became suffragan of Dubuque) |
| 1912.03.23 | USA | Apostolic Vicariate of Brownsville was suppressed (to establish Diocese of Corpus Christi) |
| 1912.03.23 | USA | Diocese of Corpus Christi was established (from the suppressed Apostolic Vicariate of Brownsville and became suffragan of New Orleans) |
| 1912.04.20 |  France | Diocese of Tarbes was renamed as Diocese of Tarbes et Lourdes |
| 1912.04.27 |  China | Apostolic Vicariate of Coastal Chi-Li 直隸海濱 was established (from Apostolic Vicariate of Northern Chi-Li 直隸北境) |
| 1912.06.01 |  Solomon Islands | Apostolic Prefecture of South Solomons was promoted as Apostolic Vicariate of South Solomons |
| 1912.06.08 |  Hungary | Diocese of Hajdúdorog (Hungarian Rite) was established (from Metropolitanate sui juris of Făgăraş şi Alba Iulia, Metropolitan Archdiocese of Esztergom, Diocese of Gherla, Armenopoli, Szamos-Ujvár, Diocese of Mukačeve, Diocese of Oradea Mare and Diocese of Prešov and became suffragan of Esztergom) |
| 1912.06.15 |  Canada | Apostolic Exarchate of Canada (Ukrainian Rite) was established |
| 1912.06.20 |  Colombia | Mission sui juris of San Andrés y Providencia was established (from Metropolitan Archdiocese of Cartagena) |
| 1912.08.13 |  Japan | Apostolic Prefecture of Niigata 新潟 was established (from Metropolitan Archdiocese of Tokyo 東京, Diocese of Hakodate 函館 and Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1912.10.04 | Peru | Apostolic Prefecture of Putumayo was established (from Apostolic Prefecture of San León del Amazonas) |
| 1912.11.30 | Canada | Diocese of Calgary was established (from Diocese of Saint Albert and became suffragan of Edmonton) |
| 1912.11.30 | Canada | Diocese of Saint Albert was promoted as Metropolitan Archdiocese of Edmonton (with suffragan see Calgary and lost territory to establish Diocese of Calgary) |
| 1912.12.10 |  Cuba | Diocese of Camagüey was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1912.12.10 | Cuba | Diocese of Matanzas was established (from Diocese of La Habana and became suffragan of Santiago) |
| 1912.12.12 |  Rwanda | Apostolic Vicariate of Kivu was established (from Apostolic Vicariate of Southern Victoria-Nyanza and Apostolic Vicariate of Unianyembé) |
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