 | 1883 | 1884 | 1885 |  |
Date | Country | Change |
| 1884 |  Turkiye | Diocese of Mush (Armenian Rite) was established |
| 1884.03.07 |  USA | Apostolic Vicariate of Montana was promoted as Diocese of Helena (became suffragan of Oregon City) |
| 1884.04.15 | USA | Diocese of Manchester was established (from Diocese of Portland in Maine and became suffragan of Boston) |
| 1884.05.02 |  Nigeria | Apostolic Prefecture of Upper Niger was established (from Apostolic Vicariate of Deux Guinées) |
| 1884.06.27 |  Romania | Apostolic Vicariate of Moldavia was promoted as Diocese of Iaşi (without ecclesiastical province) |
| 1884.09.01 |  Switzerland | Apostolic Administration of Ticino was established (from Metropolitan Archdiocese of Milano and Diocese of Como) |
| 1884.11.10 |  Tunisia | Metropolitan Archdiocese of Carthage was restored (from the suppressed Apostolic Vicariate of Tunis) |
| 1884.11.10 | Tunisia | Apostolic Vicariate of Tunis was suppressed (to establish Metropolitan Archdiocese of Carthage) |
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