 | 1837 | 1838 | 1839 |  |
Date | Country | Change |
| 1838 |  Algeria | Titular Episcopal See of Icosium was suppressed |
| 1838 |  Italy | Territorial Abbacy of Montecassino lost territory to Diocese of San Marco |
| 1838 |  Malaysia | Diocese of Malacca was suppressed (to Apostolic Vicariate of Ava and Pegu) |
| 1838 |  Ukraine | Metropolitan Archdiocese of Kyiv (Ukrainian Rite) was suppressed |
| 1838.01.29 |  Ecuador | Diocese of Guayaquil was established (from Diocese of Cuenca and became suffragan of Lima) |
| 1838.02.01 |  Egypt | Titular Patriarchal See of Alexandria (Greek-Melkite Rite) was established |
| 1838.02.01 |  Palestine | Patriarchal Vicariate of Jerusalem (Greek-Melkite Rite) was established |
| 1838.02.01 | Palestine,  Israel | Titular Patriarchal See of Jerusalem (Greek-Melkite Rite) was established |
| 1838.04.24 |  India | Diocese of Cochin was suppressed (to Apostolic Vicariate of Verapoly) |
| 1838.04.24 | India | Archdiocese of Cranganor was suppressed (to Apostolic Vicariate of Verapoly) |
| 1838.04.24 | India | Diocese of São Tomé de Meliapor was suppressed (to Apostolic Vicariate of Madras) |
| 1838.08.10 | Algeria | Apostolic Vicariate of Alger was promoted as Diocese of Alger–Iulia Caesarea (became suffragan of Aix and depended on Sacred Consistorial Congregation) |
| 1838.08.14 |  China | Apostolic Vicariate of Chekiang 浙江 was renamed as Apostolic Vicariate of Chekiang and Kiangsi 浙江江西 (gained territory from the suppressed Apostolic Vicariate of Kiangxi 江西) |
| 1838.08.14 | China | Apostolic Vicariate of Kiangxi 江西 was suppressed (to Apostolic Vicariate of Chekiang and Kiangsi 浙江江西) |
| 1838.08.14 | China | Apostolic Vicariate of Liaotung 遼東 was established (from Diocese of Beijing 北京) |
| 1838.09.17 |  Iraq | Patriarchal Exarchate of Iraq (Greek-Melkite Rite) was established |
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