 | 1825 | 1826 | 1827 |  |
Date | Country | Change |
| 1826 |  Germany | Diocese of Würzburg lost territory to Metropolitan Archdiocese of Bamberg |
| 1826.01.27 |  Canada | Apostolic Vicariate of Upper Canada was promoted as Diocese of Kingston |
| 1826.04.23 |  Poland | Diocese of Tyniec was renamed as Diocese of Tarnów |
| 1826.07.15 |  Brazil | Territorial Prelature of Cuiabá was promoted as Diocese of Cuiabá |
| 1826.07.15 | Brazil | Territorial Prelature of Goiás was promoted as Diocese of Goiás |
| 1826.07.18 |  USA | Apostolic Vicariate of Mississippi was suppressed (to Diocese of New Orleans) |
| 1826.07.18 | USA | Diocese of Louisiana was renamed as Diocese of New Orleans (gained territory from the suppressed Apostolic Vicariate of Mississippi and lost territory to establish Diocese of Saint Louis) |
| 1826.07.18 | USA | Diocese of Saint Louis was established (from Diocese of Durango and Diocese of Louisiana and without ecclesiastical province) |
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