 | 1890 | 1891 | 1892 |  |
Date | Country | Change |
| 1891 |  USA | Apostolic Vicariate of Arizona lost territory to Diocese of Dallas |
| 1891.01.27 | USA | Apostolic Vicariate of Utah was promoted as Diocese of Salt Lake |
| 1891.03.13 |  Mali | Apostolic Prefecture of Sahara and Sudan was promoted as Apostolic Vicariate of Sahara and Sudan |
| 1891.04.17 |  Japan | Apostolic Prefecture of Hakodate 函館 was established (from Apostolic Vicariate of Northern Japan 日本北緯) |
| 1891.05.29 | USA | Apostolic Prefecture of Indian Territory was promoted as Apostolic Vicariate of Indian Territory |
| 1891.05.29 | USA | Diocese of Leavenworth was renamed as Diocese of Kansas City, Kansas |
| 1891.06.04 |  Canada | Apostolic Vicariate of Saskatchewan was established (from Metropolitan Archdiocese of Saint-Boniface and became suffragan of Saint-Boniface) |
| 1891.06.15 | Japan | Apostolic Prefecture of Hakodate 函館 was promoted as Diocese of Hakodate 函館 (became suffragan of Tokyo 東京) |
| 1891.06.15 | Japan | Apostolic Vicariate of Southern Japan 日本南緯 was promoted as Diocese of Nagasaki 長崎 (became suffragan of Tokyo 東京) |
| 1891.06.15 | Japan | Apostolic Vicariate of Central Japan 日本中部 was promoted as Diocese of Osaka 大阪 (became suffragan of Tokyo 東京) |
| 1891.06.15 | Japan | Apostolic Vicariate of Northern Japan 日本北緯 was promoted as Metropolitan Archdiocese of Tokyo 東京 (with suffragan sees Hakodate 函館, Nagasaki 長崎 and Osaka 大阪) |
| 1891.06.23 |  Mexico | Diocese of Antequera was promoted as Metropolitan Archdiocese of Antequera (with suffragan sees Chiapas, Tabasco, Tehuantepec and Yucatán and lost territory to establish Diocese of Tehuantepec) |
| 1891.06.23 | Mexico | Diocese of Chihuahua was established (from Diocese of Durango and became suffragan of Durango) |
| 1891.06.23 | Mexico | Diocese of Cuernavaca was established (from Metropolitan Archdiocese of México and became suffragan of México) |
| 1891.06.23 | Mexico | Diocese of Durango was promoted as Metropolitan Archdiocese of Durango (with suffragan sees Chihuahua, Sinaloa, Sonora and California Inferiore and lost territory to establish Diocese of Chihuahua) |
| 1891.06.23 | Mexico | Diocese of Linares was promoted as Metropolitan Archdiocese of Linares (with suffragan sees Ciudad Victoria–Tamaulipas and Saltillo and lost territory to establish Diocese of Saltillo) |
| 1891.06.23 | Mexico | Diocese of Saltillo was established (from Diocese of Linares and became suffragan of Linares) |
| 1891.06.23 | Mexico | Diocese of Tehuantepec was established (from Diocese of Antequera and became suffragan of Antequera) |
| 1891.06.23 | Mexico | Diocese of Tepic was established (from Metropolitan Archdiocese of Guadalajara and became suffragan of Guadalajara) |
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