| Date | Country | Change |
| 2020.01.07 | Diocese of Abu Qurqas (Coptic Rite) was established (from Diocese of Minya and became suffragan of Alexandria) | |
| 2020.02.15 | Territorial Prelature of Cancún–Chetumal was promoted as Diocese of Cancún–Chetumal | |
| 2020.03.02 | Diocese of Maldonado–Punta del Este was renamed as Diocese of Maldonado–Punta del Este–Minas (gained territory from the suppressed Diocese of Minas) | |
| 2020.03.02 | Diocese of Minas was suppressed (to Diocese of Maldonado–Punta del Este–Minas) | |
| 2020.03.05 | Diocese of Ekwulobia was established (from Diocese of Awka and became suffragan of Onitsha) | |
| 2020.04.02 | Apostolic Vicariate of Kontagora was promoted as Diocese of Kontagora (became suffragan of Kaduna) | |
| 2020.05.06 | Diocese of Alexandria–Cornwall was suppressed (to Metropolitan Archdiocese of Ottawa–Cornwall) | |
| 2020.05.06 | Metropolitan Archdiocese of Ottawa was renamed as Metropolitan Archdiocese of Ottawa–Cornwall (gained territory from the suppressed Diocese of Alexandria–Cornwall) | |
| 2020.05.19 | Metropolitan Archdiocese of Anchorage was renamed as Metropolitan Archdiocese of Anchorage–Juneau (gained territory from the suppressed Diocese of Juneau and lost suffragan see Juneau) | |
| 2020.05.19 | Diocese of Juneau was suppressed (to Metropolitan Archdiocese of Anchorage–Juneau) | |
| 2020.05.30 | Diocese of Owando was promoted as Metropolitan Archdiocese of Owando (with suffragan sees Impfondo and Ouesso) | |
| 2020.05.30 | Diocese of Pointe-Noire was promoted as Metropolitan Archdiocese of Pointe-Noire (with suffragan sees Dolisie and Nkayi) | |
| 2020.06.27 | Diocese of Amadiyah and Zaku (Chaldean Rite) was renamed as Diocese of Duhok (lost territory to establish Diocese of Zakho) | |
| 2020.06.27 | Diocese of Zakho (Chaldean Rite) was restored (from Diocese of Amadiyah and Zaku and became suffragan of Babylon) | |
| 2020.09.10 | Titular Metropolitan See of Tagritum (Syriac Rite) was demoted as Titular Episcopal See of Tagritum | |
| 2020.09.21 | Diocese of Saint Ephrem of Khadki (Syro-Malankara Rite) lost territory to Diocese of Marthandam and Diocese of Puthur | |
| 2020.09.29 | Territorial Prelature of Sicuani was promoted as Diocese of Sicuani | |
| 2020.11.25 | Diocese of Olsztyn–Gdańsk (Ukrainian Rite) was established (from Metropolitan Archdiocese of Przemyśl–Warszawa and Diocese of Wrocław–Gdańsk and became suffragan of Przemyśl–Warszawa) | |
| 2020.11.25 | Diocese of Wrocław–Gdańsk (Ukrainian Rite) was renamed as Diocese of Wrocław–Koszalin (lost territory to establish Diocese of Olsztyn–Gdańsk) |
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