 | 1919 | 1920 | 1921 |  |
Date | Country | Change |
| 1920 |  Turkiye | Diocese of Prusa (Armenian Rite) was suppressed |
| 1920 | Turkiye | Titular Episcopal See of Theodosiopolis (Greek Rite) was established |
| 1920.02.13 |  Brazil | Diocese of Maceió was promoted as Metropolitan Archdiocese of Maceió (with suffragan sees Aracaju and Penedo) |
| 1920.04.08 |  Italy | Abbacy nullius of Santa Maria di Polsi was suppressed (to Diocese of Gerace and united to Diocese of Gerace) |
| 1920.04.09 |  China | Apostolic Vicariate of Shaozhou 韶州 was established (from Apostolic Vicariate of Guangzhou 廣州) |
| 1920.04.16 |  Nigeria | Apostolic Prefecture of Lower Niger was promoted as Apostolic Vicariate of Southern Nigeria |
| 1920.04.18 |  Guinea | Apostolic Prefecture of French Guinea was promoted as Apostolic Vicariate of French Guinea |
| 1920.04.30 |  Croatia | Apostolic Administration of Fiume was established (from Diocese of Senj–Modruš) |
| 1920.05.22 |  Argentina | Diocese of Catamarca lost territory to Diocese of Salta |
| 1920.06.08 |  Finland,  Åland Islands | Apostolic Vicariate of Finland was established (from Metropolitan Archdiocese of Mohilev) |
| 1920.06.09 |  Lithuania | Metropolitan Archdiocese of Kaunas lost territory to Diocese of Riga |
| 1920.06.09 | Lithuania | Diocese of Žemaitija lost territory to Diocese of Riga |
| 1920.06.18 | Brazil | Territorial Prelature of Bom Jesus do Piauí was established (from Diocese of Piaui and became suffragan of Belém do Pará) |
| 1920.08.01 | China | Apostolic Vicariate of Western Guangdong and Hainan 粵西海南 was established (from Apostolic Vicariate of Guangzhou 廣州) |
| 1920.08.05 |  North Korea | Apostolic Vicariate of Wonsan 원산 was established (from Apostolic Vicariate of Seoul 서울) |
| 1920.08.25 | China | Apostolic Vicariate of Eastern Kiangsi 江西東境 was renamed as Apostolic Vicariate of Fuzhou 撫州 |
| 1920.08.25 | China | Apostolic Vicariate of Ganzhou 贛州 was established (from Apostolic Vicariate of Southern Kiangsi 江西南境) |
| 1920.08.25 | China | Apostolic Vicariate of Southern Kiangsi 江西南境 was renamed as Apostolic Vicariate of Jing’an 晶安 (lost territory to establish Apostolic Vicariate of Ganzhou 贛州) |
| 1920.08.25 | China | Apostolic Vicariate of Northern Kiangxi 江西北境 was renamed as Apostolic Vicariate of Jiujiang 九江 |
| 1920.08.29 |  Indonesia | Apostolic Prefecture of Dutch New Guinea was promoted as Apostolic Vicariate of Dutch New Guinea |
| 1920.11.12 | Croatia | Diocese of Krk lost territory to Apostolic Administration of Fiume |
| 1920.11.17 |  Canada | Apostolic Prefecture of Northern Ontario was promoted as Apostolic Vicariate of Northern Ontario |
| 1920.12.10 |  Poland | Diocese of Łódź was established (from Metropolitan Archdiocese of Warszawa and became suffragan of Warszawa) |
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