 | 1898 | 1899 | 1900 |  |
Date | Country | Change |
| 1899 |  Algeria | Titular Episcopal See of Tubunæ was restored |
| 1899 |  Egypt | Titular Episcopal See of Rhinocolura was restored |
| 1899 |  Italy | Territorial Abbacy of Monte Oliveto Maggiore was established (from Diocese of Arezzo) |
| 1899 |  Syria | Titular Episcopal See of Circesium was restored |
| 1899.02.03 | Syria | Diocese of Aleppo (Armenian Rite) was promoted as Archdiocese of Aleppo |
| 1899.05.04 |  Thailand | Apostolic Vicariate of Laos was established (from Apostolic Vicariate of Eastern Siam) |
| 1899.05.15 |  Peru | Diocese of Huaraz was established (from Metropolitan Archdiocese of Lima and became suffragan of Lima) |
| 1899.08.27 |  Mexico | Diocese of Aguascalientes was established (from Metropolitan Archdiocese of Guadalajara and became suffragan of Guadalajara) |
| 1899.09.01 |  India | Diocese of Kumbakonam was established (from Metropolitan Archdiocese of Pondicherry and became suffragan of Pondicherry) |
| 1899.12.23 |  China | Apostolic Vicariate of Eastern Chi-Li 直隸東境 was established (from Apostolic Vicariate of Northern Chi-Li 直隸北境) |
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