 | 1889 | 1890 | 1891 |  |
Date | Country | Change |
| 1890 |  Egypt | Titular Episcopal See of Tanasia was suppressed |
| 1890 |  Israel | Titular Episcopal See of Giovanni S. d’Acri (Maronite Rite) was suppressed |
| 1890 |  Romania | Titular Archiepiscopal See of Constantia antea Tomi was restored |
| 1890 |  Serbia | Titular Episcopal See of Remesiana was restored |
| 1890 |  Tunisia | Titular Episcopal See of Obba was restored |
| 1890 | Tunisia | Titular Episcopal See of Vaga was restored |
| 1890 |  Turkiye | Titular Metropolitan See of Antiochia was restored |
| 1890 | Turkiye | Titular Metropolitan See of Synnadæ was restored |
| 1890 | Turkiye | Titular Episcopal See of Teja was renamed as Titular Episcopal See of Teos |
| 1890.01.21 |  Canada | Diocese of Alexandria in America was established (from Metropolitan Archdiocese of Kingston and became suffragan of Kingston) |
| 1890.03.18 |  Cameroon | Apostolic Prefecture of Cameroun was established (from Apostolic Vicariate of Deux Guinées) |
| 1890.03.18 |  Gabon | Apostolic Vicariate of Deux Guinées was renamed as Apostolic Vicariate of Gabon (lost territory to establish Apostolic Prefecture of Cameroun) |
| 1890.06.17 |  China | Apostolic Vicariate of Northern Shanxi 山西北境 was established (from Apostolic Vicariate of Shanxi 山西) |
| 1890.06.17 | China | Apostolic Vicariate of Shanxi 山西 was renamed as Apostolic Vicariate of Southern Shanxi 山西南境 (lost territory to establish Apostolic Vicariate of Northern Shanxi 山西北境) |
| 1890.07 |  India | Mission sui juris of Rajputana was established (from Metropolitan Archdiocese of Agra) |
| 1890.07.08 |  Bosnia and Herzegovina | Diocese of Trebinje–Mrkan was suppressed (to Diocese of Mostar–Duvno and united to Diocese of Mostar–Duvno) |
| 1890.07.15 |  USA | Diocese of Dallas was established (from Diocese of Galveston and became suffragan of New Orleans) |
| 1890.09.02 | Canada | Apostolic Vicariate of British Columbia was promoted as Diocese of New Westminster (became suffragan of Saint-Boniface) |
| 1890.09.04 |  Iran | Metropolitan Archdiocese of Urmyā (Chaldean Rite) was restored (with suffragan see Salmas) |
| 1890.10.14 |  Congo-Brazzaville | Apostolic Vicariate of Congo français was renamed as Apostolic Vicariate of Bas-Congo français (lost territory to establish Apostolic Vicariate of Haut-Congo français) |
| 1890.10.14 | Congo-Brazzaville | Apostolic Vicariate of Haut-Congo français was established (from Apostolic Vicariate of Congo français) |
| 1890.12.08 |  Papua New Guinea | Apostolic Vicariate of New Britain was renamed as Apostolic Vicariate of New Pomerania |
| 1890.12.30 |  Albania | Diocese of Sapë lost territory to Territorial Abbacy of Shën Llezhri i Oroshit |
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