 | 1902 | 1903 | 1904 |  |
Date | Country | Change |
| 1903 |  Jordan | Titular Episcopal See of Areopolis was promoted as Titular Archiepiscopal See of Areopolis |
| 1903.01.15 |  South Africa | Apostolic Vicariate of Orange Free State was renamed as Apostolic Vicariate of Kimberley in Orange |
| 1903.02.20 |  Cuba | Diocese of Cienfuegos was established (from Diocese of La Habana and became suffragan of Santiago) |
| 1903.02.20 | Cuba | Diocese of Pinar del Río was established (from Diocese of La Habana and became suffragan of Santiago) |
| 1903.04.18 |  Liberia | Apostolic Prefecture of Liberia was established (from Apostolic Vicariate of Sierra Leone) |
| 1903.06.19 |  Canada | Diocese of Vancouver Island was promoted as Metropolitan Archdiocese of Vancouver Island (with suffragan sees New Westminster and Mackenzie) |
| 1903.06.19 |  USA | Diocese of Baker City was established (from Metropolitan Archdiocese of Oregon City and became suffragan of Oregon City) |
| 1903.06.23 |  Colombia | Apostolic Prefecture of Intendencias Orientales was established (from Metropolitan Archdiocese of Bogotá in Colombia) |
| 1903.06.30 |  Congo-Kinshasa | Mission sui juris of Kwango was promoted as Apostolic Prefecture of Kwango |
| 1903.08.11 |  Mexico | Diocese of Puebla–Tlaxcala was promoted as Metropolitan Archdiocese of Puebla de los Ángeles (with suffragan see Mixtecas) |
| 1903.09.21 |  Brazil | Territorial Prelature of Santarém was established (from Diocese of Belém do Pará and without ecclesiastical province) |
| 1903.11.13 | Mexico | Diocese of Mixtecas was renamed as Diocese of Huajuapan de León |
| 1903.12.03 |  Malawi | Apostolic Prefecture of Shiré was established (from Apostolic Vicariate of Nyassa) |
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