 | 1930 | 1931 | 1932 |  |
Date | Country | Change |
| 1931 |  Algeria | Titular Episcopal See of Bida was renamed as Titular Episcopal See of Bida |
| 1931 | Algeria | Titular Episcopal See of Bita was established |
| 1931 |  Greece | Titular Episcopal See of Abdera was suppressed |
| 1931 |  Turkiye | Titular Episcopal See of Theodosiopolis was suppressed |
| 1931 | Titular Episcopal See of Parœcopolis was suppressed | |
| 1931 | Titular Episcopal See of Themiscyra was suppressed | |
| 1931.01.03 |  Congo-Kinshasa | Mission sui juris of Bikoro was established (from Apostolic Vicariate of Léopoldville and Apostolic Prefecture of Coquilhatville) |
| 1931.01.04 |  Zimbabwe | Mission sui juris of Bulawayo was established (from Apostolic Prefecture of Salisbury) |
| 1931.01.12 |  Colombia | Apostolic Prefecture of Sinú was renamed as Apostolic Prefecture of Sinú–San Jorge |
| 1931.03.03 |  India | Mission sui juris of Indore was established (from Diocese of Ajmer, Diocese of Allahabad and Diocese of Nagpur) |
| 1931.03.03 | Zimbabwe | Apostolic Prefecture of Salisbury was promoted as Apostolic Vicariate of Salisbury |
| 1931.03.27 |  USA | Diocese of Reno was established (from Diocese of Sacramento and Diocese of Salt Lake and became suffragan of San Francisco) |
| 1931.03.31 |  Cameroon | Apostolic Prefecture of Douala was established (from Apostolic Vicariate of Cameroun) |
| 1931.04.01 | Congo-Kinshasa | Apostolic Vicariate of Kisantu was established (from Apostolic Vicariate of Kwango) |
| 1931.04.03 | Cameroon | Apostolic Vicariate of Cameroun was renamed as Apostolic Vicariate of Yaoundé |
| 1931.04.05 |  China | Mission sui juris of Linqing 臨清 was promoted as Apostolic Prefecture of Linqing 臨清 |
| 1931.04.07 |  Norway | Mission sui juris of Central Norway was restored (from Apostolic Vicariate of Norway) |
| 1931.04.08 | Norway,  Svalbard and Jan Mayen | Mission sui juris of Northern Norway was established (from Apostolic Vicariate of Norway) |
| 1931.04.10 | Norway,  Bouvet Island | Apostolic Vicariate of Norway was renamed as Apostolic Vicariate of Oslo |
| 1931.05.06 | China | Mission sui juris of Jianningfu 建寧府 was established (from Apostolic Vicariate of Fuzhou 福州) |
| 1931.05.06 | China | Apostolic Prefecture of Lixian 澧縣 was established (from Apostolic Vicariate of Changde 常德) |
| 1931.05.06 |  Gambia | Mission sui juris of Gambia was established (from Apostolic Prefecture of Sénégal) |
| 1931.05.07 | China | Apostolic Prefecture of Yueyang 岳陽 was established (from Apostolic Vicariate of Changde 常德) |
| 1931.05.22 |  Brazil | Territorial Prelature of Juruá was established (from Apostolic Prefecture of Tefé and became suffragan of Belém do Pará) |
| 1931.05.28 | China | Apostolic Administration of Harbin 哈爾濱 was established (from Diocese of Vladivostok) |
| 1931.06.16 | China | Apostolic Prefecture of Yiduxian 益都縣 was established (from Apostolic Vicariate of Zhifou 芝罘) |
| 1931.06.16 | India,  Bhutan | Mission sui juris of Sikkim was promoted as Apostolic Prefecture of Sikkim |
| 1931.06.17 | China | Apostolic Prefecture of Yuci 榆次 was established (from Apostolic Vicariate of Taiyuanfu 太原府) |
| 1931.06.18 | China | Mission sui juris of Weihai 威海 was established (from Apostolic Vicariate of Zhifou 芝罘) |
| 1931.06.19 |  Mexico | Metropolitan Archdiocese of Puebla de los Ángeles lost territory to Diocese of Papantla |
| 1931.06.20 | Turkiye | Mission sui juris of Trabzon was restored (from Apostolic Vicariate of Constantinopole) |
| 1931.07.01 | China | Apostolic Prefecture of Xuzhou 徐州 was established (from Apostolic Vicariate of Nanjing 南京) |
| 1931.07.02 | China | Apostolic Prefecture of Chuzhou 處州 was established (from Apostolic Vicariate of Ningbo 寧波) |
| 1931.08.11 |  Uruguay | Diocese of Florida–Melo was established (from the suppressed Diocese of Melo and became suffragan of Montevideo) |
| 1931.08.11 | Uruguay | Diocese of Melo was suppressed (to establish Diocese of Florida–Melo) |
| 1931.08.17 | China | Mission sui juris of Qiqihar 齊齊哈爾 was promoted as Apostolic Prefecture of Qiqihar 齊齊哈爾 |
| 1931.08.20 | Greece | Diocese of Chios lost territory to Archdiocese of Rhodes |
| 1931.08.20 | Turkiye | Metropolitan Archdiocese of Izmir lost territory to Diocese of Chios |
| 1931.08.22 |  Papua New Guinea | Apostolic Prefecture of Central New Guinea was promoted as Apostolic Vicariate of Central New Guinea |
| 1931.11.01 | China | Apostolic Prefecture of Sanyuan 三原 was established (from Apostolic Vicariate of Xi’anfu 西安府) |
| 1931.11.03 | China | Mission sui juris of Tongzhou 同州 was established (from Apostolic Vicariate of Xi’anfu 西安府) |
| 1931.12.13 | China | Mission sui juris of Dali 大理 was promoted as Apostolic Prefecture of Dali 大理 |
| 1931.12.21 |  Canada | Apostolic Prefecture of Baie d’Hudson was promoted as Apostolic Vicariate of Baie d’Hudson |
| 1931.12.22 |  Tanzania | Territorial Abbacy of Ndanda was established (from Territorial Abbacy of Lindi) |
| 1931.12.23 | Tanzania | Territorial Abbacy of Lindi was renamed as Territorial Abbacy of Peramiho |
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