| Date | Country | Change |
| 1898 | Apostolic Vicariate of Tibet 西藏 lost territory to Metropolitan Archdiocese of Calcutta | |
| 1898 | Diocese of Cassano all’Jonio lost territory to Diocese of Policastro | |
| 1898 | Diocese of Montepeloso was renamed as Diocese of Irsina | |
| 1898 | Titular Episcopal See of Cæsarea Paneas was renamed as Titular Episcopal See of Cæsarea Paneas | |
| 1898.01.30 | Diocese of Geraldton was established (from Diocese of Perth and became suffragan of Sydney) | |
| 1898.03.28 | Diocese of Indianapolis was established (from the suppressed Diocese of Vincennes and became suffragan of Cincinnati) | |
| 1898.03.28 | Diocese of Vincennes was suppressed (to establish Diocese of Indianapolis) | |
| 1898.05.02 | Apostolic Prefecture of Orange River was promoted as Apostolic Vicariate of Orange River | |
| 1898.05.04 | Apostolic Vicariate of Pontiac was promoted as Diocese of Pembroke | |
| 1898.05.10 | 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 | 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 | Apostolic Prefecture of Uélé was established (from Apostolic Vicariate of Congo Belge) | |
| 1898.05.12 | Apostolic Vicariate of Wales was promoted as Diocese of Menevia (became suffragan of Westminster) | |
| 1898.05.23 | Apostolic Prefecture of German Solomon Islands was established (from Apostolic Vicariate of New Pomerania) | |
| 1898.06.08 | Metropolitan Archdiocese of Santafé en Nueva Granada was renamed as Metropolitan Archdiocese of Bogotá in Colombia | |
| 1898.07.05 | Apostolic Vicariate of Madagascar was renamed as Apostolic Vicariate of Central Madagascar (lost territory to establish Apostolic Vicariate of Northern Madagascar) | |
| 1898.07.05 | Apostolic Vicariate of Northern Madagascar was established (from Apostolic Vicariate of Madagascar) |
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