 | 1917 | 1918 | 1919 |  |
Date | Country | Change |
| 1918 |  South Africa | Apostolic Vicariate of Kimberley in Orange was renamed as Apostolic Vicariate of Kimberley in South Africa |
| 1918.01.11 |  USA | Diocese of Lafayette in Louisiana was established (from Metropolitan Archdiocese of New Orleans and became suffragan of New Orleans) |
| 1918.01.17 |  Portugal | Diocese of Leiria was restored (from Patriarchal See of Lisboa and Diocese of Coimbra and became suffragan of Lisboa) |
| 1918.03.13 |  Indonesia | Apostolic Prefecture of Dutch Borneo was promoted as Apostolic Vicariate of Dutch Borneo |
| 1918.03.14 |  Colombia | Apostolic Prefecture of Urabá was established |
| 1918.07.18 |  Brazil | Diocese of Aterrado was established (from Metropolitan Archdiocese of Mariana and Diocese of Uberaba and became suffragan of Mariana) |
| 1918.07.26 | Brazil | Metropolitan Archdiocese of Olinda was renamed as Metropolitan Archdiocese of Olinda e Recife |
| 1918.08.02 | Brazil | Diocese of Floresta was suppressed (to establish Diocese of Pesqueira) |
| 1918.08.02 | Brazil | Diocese of Garanhuns was established (from Metropolitan Archdiocese of Olinda e Recife and became suffragan of Olinda e Recife) |
| 1918.08.02 | Brazil | Diocese of Nazaré was established (from Metropolitan Archdiocese of Olinda e Recife and became suffragan of Olinda e Recife) |
| 1918.08.02 | Brazil | Diocese of Pesqueira was established (from Metropolitan Archdiocese of Olinda e Recife, from the suppressed Diocese of Floresta and became suffragan of Olinda e Recife) |
| 1918.08.24 |  Madagascar | Apostolic Prefecture of Betafó was promoted as Apostolic Vicariate of Betafó |
| 1918.08.24 |  Nigeria | Apostolic Prefecture of Western Nigeria was promoted as Apostolic Vicariate of Western Nigeria |
| 1918.09.22 |  Latvia | Diocese of Riga was restored (from Metropolitan Archdiocese of Mohilev) |
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