 | 1897 | 1898 | 1899 |  |
Date | Country | Change |
| 1898 |  China | Apostolic Vicariate of Tibet 西藏 lost territory to Metropolitan Archdiocese of Calcutta |
| 1898 |  Italy | Diocese of Cassano all’Jonio lost territory to Diocese of Policastro |
| 1898 | Italy | Diocese of Montepeloso was renamed as Diocese of Irsina |
| 1898 |  Syria | Titular Episcopal See of Cæsarea Paneas was renamed as Titular Episcopal See of Cæsarea Paneas |
| 1898.01.30 |  Australia | Diocese of Geraldton was established (from Diocese of Perth and became suffragan of Sydney) |
| 1898.03.28 |  USA | Diocese of Indianapolis was established (from the suppressed Diocese of Vincennes and became suffragan of Cincinnati) |
| 1898.03.28 | USA | Diocese of Vincennes was suppressed (to establish Diocese of Indianapolis) |
| 1898.05.02 |  South Africa | Apostolic Prefecture of Orange River was promoted as Apostolic Vicariate of Orange River |
| 1898.05.04 |  Canada | Apostolic Vicariate of Pontiac was promoted as Diocese of Pembroke |
| 1898.05.10 | China | Apostolic Vicariate of Northern Manchuria 滿州北境 was established (from Apostolic Vicariate of Liaotung and Manchuria 遼東滿州) |
| 1898.05.10 | China | Apostolic Vicariate of Liaotung and Manchuria 遼東滿州 was renamed as Apostolic Vicariate of Southern Manchuria 南滿 (lost territory to establish Apostolic Vicariate of Northern Manchuria 滿州北境) |
| 1898.05.12 |  Congo-Kinshasa | Apostolic Prefecture of Uélé was established (from Apostolic Vicariate of Congo Belge) |
| 1898.05.12 |  Wales | Apostolic Vicariate of Wales was promoted as Diocese of Menevia (became suffragan of Westminster) |
| 1898.05.23 |  Papua New Guinea | Apostolic Prefecture of German Solomon Islands was established (from Apostolic Vicariate of New Pomerania) |
| 1898.06.08 |  Colombia | Metropolitan Archdiocese of Santafé en Nueva Granada was renamed as Metropolitan Archdiocese of Bogotá in Colombia |
| 1898.07.05 |  Madagascar | Apostolic Vicariate of Madagascar was renamed as Apostolic Vicariate of Central Madagascar (lost territory to establish Apostolic Vicariate of Northern Madagascar) |
| 1898.07.05 | Madagascar | Apostolic Vicariate of Northern Madagascar was established (from Apostolic Vicariate of Madagascar) |
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