 | 1888 | 1889 | 1890 |  |
Date | Country | Change |
| 1889 |  Canada | Diocese of Saint Albert lost territory to Metropolitan Archdiocese of Saint-Boniface |
| 1889.01.14 |  Croatia | Diocese of Hvar was renamed as Diocese of Hvar–Brač–Vis |
| 1889.02.08 |  French Polynesia,  Pitcairn Islands | Apostolic Vicariate of Tahiti Islands lost territory to Metropolitan Archdiocese of Santiago |
| 1889.05.10 |  Micronesia | Apostolic Vicariate of Micronesia was suppressed (to Apostolic Vicariate of New Britain) |
| 1889.05.10 |  Papua New Guinea | Apostolic Vicariate of Melanesia was renamed as Apostolic Vicariate of New Britain (gained territory from the suppressed Apostolic Vicariate of Micronesia and lost territory to establish Apostolic Vicariate of New Guinea) |
| 1889.05.10 | Papua New Guinea | Apostolic Vicariate of New Guinea was established (from Apostolic Vicariate of Melanesia) |
| 1889.06.28 |  United Arab Emirates,  Oman,  Yemen | Apostolic Vicariate of Aden was renamed as Apostolic Vicariate of Arabia |
| 1889.07.01 |  USA | Diocese of Allegheny was suppressed (to Diocese of Pittsburgh) |
| 1889.07.17 |  Spain | Diocese of Pamplona–Tudela was renamed as Diocese of Pamplona (lost territory to establish Diocese of Tudela) |
| 1889.07.17 | Spain | Diocese of Tudela was restored (from Diocese of Pamplona–Tudela and became suffragan of Zaragoza) |
| 1889.07.25 |  Nigeria | Apostolic Prefecture of Lower Niger was established (from Apostolic Vicariate of Deux Guinées) |
| 1889.07.31 |  Malawi | Apostolic Prefecture of Nyassa was established (from Apostolic Vicariate of Tanganyika) |
| 1889.09.22 | USA | Apostolic Vicariate of Northern Minnesota was promoted as Diocese of Saint Cloud (became suffragan of Saint Paul) |
| 1889.10.03 | USA | Diocese of Duluth was established (from Diocese of Saint Cloud and became suffragan of Saint Paul) |
| 1889.11.10 | USA | Diocese of Jamestown was established (from Apostolic Vicariate of Dakota and became suffragan of Saint Paul) |
| 1889.11.12 | USA | Apostolic Vicariate of Dakota was promoted as Diocese of Sioux Falls |
| 1889.11.26 | USA | Diocese of Winona was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
| 1889.12.13 |  India | Apostolic Prefecture of Assam was established (from Diocese of Dacca and Diocese of Krishnagar) |
| 1889.12.28 | Canada | Diocese of Kingston was promoted as Metropolitan Archdiocese of Kingston (with suffragan see Peterborough) |
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