 | 1927 | 1928 | 1929 |  |
Date | Country | Change |
| 1928 |  Algeria | Titular Episcopal See of Tuscamia was established |
| 1928 | Algeria | Titular Episcopal See of Ubaza was established |
| 1928 | Algeria | Titular Episcopal See of Vada was established |
| 1928 | Algeria | Titular Episcopal See of Zerta was established |
| 1928 |  Bulgaria | Titular Episcopal See of Odessus was promoted as Titular Archiepiscopal See of Odessus |
| 1928 |  Egypt | Titular Episcopal See of Cabasa was promoted as Titular Archiepiscopal See of Cabasa |
| 1928 |  Ethiopia | Titular Episcopal See of Adulis was promoted as Titular Metropolitan See of Adulis |
| 1928 |  Greece | Titular Episcopal See of Nysirus was renamed as Titular Episcopal See of Nisyrus |
| 1928 |  Israel | Titular Episcopal See of Joppe was renamed as Titular Episcopal See of Joppe |
| 1928 |  Lebanon | Titular Episcopal See of Beirut was promoted as Titular Archiepiscopal See of Beirut |
| 1928 |  North Macedonia | Titular Metropolitan See of Achrida (Armenian Rite) was suppressed |
| 1928 |  Russia | Titular Episcopal See of Matriga was restored |
| 1928 |  Serbia | Titular Episcopal See of Belogradum et Semendria was renamed as Titular Episcopal See of Belogradum |
| 1928 |  Tunisia | Titular Episcopal See of Eguga was established |
| 1928 | Tunisia | Titular Episcopal See of Turuzi was established |
| 1928 | Tunisia | Titular Episcopal See of Uccula was established |
| 1928 | Tunisia | Titular Episcopal See of Uzita was established |
| 1928 | Tunisia | Titular Episcopal See of Uzzipari was established |
| 1928 | Tunisia | Titular Episcopal See of Vinda was established |
| 1928 | Tunisia | Titular Episcopal See of Zuri was established |
| 1928 |  Turkiye | Titular Episcopal See of Cadossia was established |
| 1928 | Turkiye | Titular Episcopal See of Germia was promoted as Titular Archiepiscopal See of Germia |
| 1928 | Turkiye | Titular Episcopal See of Iasus was renamed as Titular Episcopal See of Iasus |
| 1928 | Turkiye | Titular Episcopal See of Parium was promoted as Titular Archiepiscopal See of Parium |
| 1928 | Turkiye | Titular Episcopal See of Pompeiopolis was promoted as Titular Archiepiscopal See of Pompeiopolis |
| 1928 | Turkiye | Titular Episcopal See of Sion was restored |
| 1928 | Turkiye | Titular Archiepiscopal See of Tarsus (Armenian Rite) was established |
| 1928 | Titular Episcopal See of Achantus was suppressed | |
| 1928 | Titular Episcopal See of Alalis was suppressed | |
| 1928 | Titular Episcopal See of Elearchia was suppressed | |
| 1928.01.19 |  Colombia | Diocese of Socorro was renamed as Diocese of Socorro y San Gil |
| 1928.01.27 |  Italy | Diocese of Galtellì–Nuoro was suppressed (to establish Diocese of Nuoro) |
| 1928.01.27 | Italy | Diocese of Nuoro was established (from the suppressed Diocese of Galtellì–Nuoro and became suffragan of Cagliari) |
| 1928.02.03 |  Chile | Apostolic Vicariate of Antofagasta was promoted as Diocese of Antofagasta (became suffragan of Santiago) |
| 1928.02.15 |  Indonesia | Apostolic Prefecture of Surabaia was established (from Apostolic Vicariate of Batavia) |
| 1928.03.27 |  Japan | Mission sui juris of Miyazaki 宮崎 was restored (from Apostolic Prefecture of Kagoshima 鹿児島 and became suffragan of Tokyo 東京) |
| 1928.03.28 | Chile | Apostolic Prefecture of Araucanía was promoted as Apostolic Vicariate of Araucanía |
| 1928.03.28 |  China | Apostolic Prefecture of Xing’anfu 興安府 was established (from Apostolic Vicariate of Hanzhongfu 漢中府) |
| 1928.03.28 | Greece | Archdiocese of Rhodes was restored (from the suppressed Apostolic Prefecture of Rhodes and adjacent islands and without ecclesiastical province) |
| 1928.03.28 | Greece | Apostolic Prefecture of Rhodes and adjacent islands was suppressed (to establish Archdiocese of Rhodes) |
| 1928.03.29 |  Congo-Kinshasa | Apostolic Prefecture of Kwango was promoted as Apostolic Vicariate of Kwango |
| 1928.04.02 | Colombia | Apostolic Prefecture of Río Magdalena was established (from Diocese of Nueva Pamplona, Diocese of Santa Marta and Diocese of Socorro y San Gil) |
| 1928.04.14 |  Brazil | Territorial Prelature of Gurupi was established (from Metropolitan Archdiocese of Belém do Pará and became suffragan of Belém do Pará) |
| 1928.04.14 | Brazil | Territorial Prelature of Marajó was established (from Metropolitan Archdiocese of Belém do Pará and became suffragan of Belém do Pará) |
| 1928.05.01 |  India | Diocese of Daman was suppressed (to Metropolitan Archdiocese of Bombay and Metropolitan Archdiocese of Goa and Daman and lost title of Cranganor) |
| 1928.05.01 | India | Metropolitan Archdiocese of Goa was renamed as Metropolitan Archdiocese of Goa and Daman (gained territory from the suppressed Diocese of Daman, gained title of Cranganor and lost suffragan see Daman) |
| 1928.05.19 |  Philippines | Diocese of Lingayen was established (from Metropolitan Archdiocese of Manila and Diocese of Nueva Segovia and became suffragan of Manila) |
| 1928.05.20 | China | Ordinariate of Harbin 哈爾濱 (Russian Rite) was established |
| 1928.06.14 | China | Apostolic Prefecture of Qingdao 青島 was promoted as Apostolic Vicariate of Qingdao 青島 |
| 1928.06.15 | India | Mission sui juris of Bellary was established (from Metropolitan Archdiocese of Madras and Diocese of Hyderabad and became suffragan of Madras) |
| 1928.06.19 | China | Apostolic Prefecture of Guide 歸德 was established (from Apostolic Vicariate of Kaifengfu 開封府) |
| 1928.07.03 | India | Diocese of Nellore was established (from Metropolitan Archdiocese of Madras and became suffragan of Madras) |
| 1928.07.09 | China | Mission sui juris of Ilan 依蘭 was established (from Apostolic Vicariate of Wonsan 원산) |
| 1928.07.09 | China | Mission sui juris of Qiqihar 齊齊哈爾 was established (from Apostolic Vicariate of Jilin 吉林 and Apostolic Vicariate of Rehe 熱河) |
| 1928.07.18 | India | Mission sui juris of Cuttack was established (from Diocese of Vizagapatam) |
| 1928.07.19 | China | Apostolic Prefecture of Yanji 延吉 was established (from Apostolic Vicariate of Wonsan 원산) |
| 1928.09.26 |  USA | Metropolitan Archdiocese of Oregon City was suppressed (to establish Metropolitan Archdiocese of Portland in Oregon) |
| 1928.09.26 | USA | Metropolitan Archdiocese of Portland in Oregon was established (from the suppressed Metropolitan Archdiocese of Oregon City and with suffragan sees Baker City, Boise City, Great Falls, Helena, Seattle and Spokane) |
| 1928.10.15 | Turkiye | Archdiocese of Istanbul (Armenian Rite) was restored (from Patriarchal See of Cilicia and without ecclesiastical province) |
| 1928.11.30 | Brazil | Diocese of Assis was established (from Diocese of Botucatu and became suffragan of São Paulo) |
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