 | 1914 | 1915 | 1916 |  |
Date | Country | Change |
| 1915 |  Algeria | Titular Episcopal See of Tipasa was renamed as Titular Episcopal See of Tipasa |
| 1915 |  Greece | Titular Archiepiscopal See of Cassiope was established |
| 1915 |  Turkiye | Titular Archiepiscopal See of Irenopolis was established |
| 1915 | Turkiye | Titular Metropolitan See of Pessinus (Armenian Rite) was suppressed |
| 1915.01.02 |  Italy | Diocese of Nocera Umbra was renamed as Diocese of Nocera Umbra–Gualdo Tadino |
| 1915.01.15 |  Tanzania | Apostolic Vicariate of Southern Victoria-Nyanza was renamed as Apostolic Vicariate of Victoria-Nyanza |
| 1915.01.15 |  Uganda | Apostolic Vicariate of Northern Victoria-Nyanza was renamed as Apostolic Vicariate of Uganda |
| 1915.01.29 |  Colombia | Diocese of Jericó was established (from Metropolitan Archdiocese of Medellín and became suffragan of Medellín) |
| 1915.02.12 | Italy | Diocese of Bisarcio was suppressed (to establish Diocese of Ozieri) |
| 1915.02.12 | Italy | Diocese of Ozieri was established (from the suppressed Diocese of Bisarcio and became suffragan of Sassari) |
| 1915.02.12 |  Japan | Apostolic Prefecture of Sapporo 札幌 was established (from Diocese of Hakodate 函館 and became suffragan of Tokyo 東京) |
| 1915.03.09 |  Zimbabwe | Mission sui juris of Zambese was promoted as Apostolic Prefecture of Zambese |
| 1915.03.10 | Algeria | Apostolic Prefecture of Ghardaïa lost territory to Apostolic Prefecture of Sénégal |
| 1915.05.26 | Colombia | Apostolic Prefecture of Arauca was established (from Apostolic Vicariate of Casanare) |
| 1915.06 | Turkiye | Diocese of Seert (Chaldean Rite) was suppressed (to Diocese of Diarbekir) |
| 1915.08.18 |  China | Apostolic Vicariate of Chaozhou 潮州 was renamed as Apostolic Vicariate of Shantou 汕頭 |
| 1915.11.10 |  Brazil | Diocese of Ceará was promoted as Metropolitan Archdiocese of Fortaleza (with suffragan sees Crato and Sobral and lost territory to establish Diocese of Sobral) |
| 1915.11.10 | Brazil | Diocese of Sobral was established (from Diocese of Ceará and became suffragan of Fortaleza) |
| 1915.12.04 |  Canada | Diocese of Regina was promoted as Metropolitan Archdiocese of Regina (with suffragan see Prince Albert) |
| 1915.12.04 | Canada | Archdiocese of Winnipeg was established (from Metropolitan Archdiocese of Saint-Boniface and without ecclesiastical province) |
| 1915.12.15 | Brazil | Diocese of Caratinga was established (from Diocese of Amazonas and became suffragan of Mariana) |
| 1915.12.20 | Brazil | Diocese of Porto Nacional was established (from Diocese of Goiás and became suffragan of Mariana) |
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