 | 1830 | 1831 | 1832 |  |
Date | Country | Change |
| 1831.04.26 |  Ireland | Collegiate nullius of Saint Nicholas was promoted as Diocese of Galway (gained territory from Metropolitan Archdiocese of Tuam and became suffragan of Tuam) |
| 1831.04.26 | Ireland | Metropolitan Archdiocese of Tuam lost territory to Diocese of Galway |
| 1831.05.23 |  Croatia | Diocese of Cittanova was suppressed (to Diocese of Trieste) |
| 1831.06.20 |  France | Diocese of Nice lost territory to Diocese of Ventimiglia |
| 1831.06.20 |  Italy | Diocese of Albenga lost territory to Diocese of Ventimiglia |
| 1831.09.09 |  South Korea,  North Korea | Apostolic Vicariate of Korea 조선 was established (from Diocese of Beijing 北京) |
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