 | 1905 | 1906 | 1907 |  |
Date | Country | Change |
| 1906.05.01 |  Brazil | Diocese of Belém do Pará was promoted as Metropolitan Archdiocese of Belém do Pará (with suffragan sees Amazonas, Piaui, São Luís do Maranhão and Santarém) |
| 1906.05.01 | Brazil | Diocese of Mariana was promoted as Metropolitan Archdiocese of Mariana (with suffragan sees Goiás and Pouso Alegre) |
| 1906.05.11 |  Tanzania | Apostolic Vicariate of Central Zanguebar was established (from Apostolic Vicariate of Northern Zanguebar) |
| 1906.08.10 | Tanzania | Apostolic Vicariate of Southern Zanguebar was renamed as Apostolic Vicariate of Dar-es-Salaam |
| 1906.11.11 |  Mexico | Diocese of Yucatán was promoted as Metropolitan Archdiocese of Yucatán (with suffragan sees Campeche and Tabasco) |
| 1906.12.21 | Tanzania | Apostolic Vicariate of Central Zanguebar was renamed as Apostolic Vicariate of Bagamoyo |
| 1906.12.21 | Tanzania | Apostolic Vicariate of Northern Zanguebar was renamed as Apostolic Vicariate of Zanzibar |
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