 | 1901 | 1902 | 1903 |  |
Date | Country | Change |
| 1902.01.15 |  USA | Diocese of Sioux City was established (from Metropolitan Archdiocese of Dubuque and became suffragan of Dubuque) |
| 1902.02.20 |  Brazil | Diocese of Piaui was established (from Diocese of São Luís do Maranhão and became suffragan of São Salvador da Bahia) |
| 1902.02.24 |  Colombia | Diocese of Medellín was promoted as Metropolitan Archdiocese of Medellín (with suffragan sees Antioquía and Manizales) |
| 1902.04.25 |  Mexico | Diocese of Mixtecas was established (from Metropolitan Archdiocese of Antequera and Diocese of Puebla–Tlaxcala and without ecclesiastical province) |
| 1902.05.08 |  Martinique | Diocese of Saint-Pierre was renamed as Diocese of Fort-de-France–Saint-Pierre |
| 1902.08.04 | USA | Diocese of Lead was established (from Diocese of Sioux Falls and became suffragan of Saint Paul) |
| 1902.09.15 |  Tanzania | Apostolic Prefecture of Southern Zanguebar was promoted as Apostolic Vicariate of Southern Zanguebar |
| 1902.09.17 |  Northern Mariana Islands | Apostolic Prefecture of Mariana Islands was established (from Diocese of Cebu) |
| 1902.12.22 |  Indonesia | Apostolic Prefecture of Dutch New Guinea was established (from Apostolic Vicariate of Batavia) |
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