 | 1833 | 1834 | 1835 |  |
Date | Country | Change |
| 1834 |  Germany | Apostolic Vicariate of Anhalt was established (from Apostolic Vicariate of Nordic Missions) |
| 1834.02.19 |  Italy | Diocese of Ortona was restored (from Metropolitan Archdiocese of Lanciano and became suffragan of Lanciano) |
| 1834.04.18 |  India | Apostolic Vicariate of Bengal was established (from Diocese of São Tomé de Meliapor) |
| 1834.05.06 |  USA | Diocese of Vincennes was established (from Diocese of Bardstown and became suffragan of Baltimore) |
| 1834.05.27 |  Belgium | Apostolic Administration of West-Vlaanderen was promoted as Diocese of Brugge (became suffragan of Mechelen) |
| 1834.06.03 |  Australia,  Norfolk Island | Apostolic Vicariate of New Holland and Van Diemen’s Land was restored (from Apostolic Vicariate of Cape of Good Hope and adjacent territories) |
| 1834.09.11 | India | Apostolic Vicariate of Sardhana was established (from Apostolic Vicariate of Tibet-Hindustan) |
| 1834.09.19 |  Argentina | Apostolic Vicariate of San Juan de Cuyo was promoted as Diocese of San Juan de Cuyo (became suffragan of La Plata) |
| 1834.11.19 | Italy | Provostry nullius of Atina was suppressed (to Territorial Abbacy of Montecassino) |
| 1834.12.03 |  Sri Lanka,  Maldives | Apostolic Vicariate of Ceylon was established (from Diocese of Cochin) |
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