 | 1983 | 1984 | 1985 |  |
Date | Country | Change |
| 1984 |  India | Diocese of Patna lost territory to Diocese of Bhagalpur |
| 1984 |  Scotland | Titular Episcopal See of Hoddom was renamed as Titular Episcopal See of Hodelm |
| 1984.02.03 |  Guatemala | Apostolic Administration of El Petén was promoted as Apostolic Vicariate of El Petén |
| 1984.02.03 |  Kenya | Apostolic Prefecture of Garissa was promoted as Diocese of Garissa (became suffragan of Nairobi) |
| 1984.02.09 |  Brazil | Diocese of Palmas lost territory to Diocese of União da Vitória |
| 1984.02.16 |  Philippines | Diocese of Mati was established (from Diocese of Tagum and became suffragan of Davao) |
| 1984.02.16 | Philippines | Diocese of San Jose de Nueva Ecija was established (from Diocese of Cabanatuan and became suffragan of Lingayen–Dagupan) |
| 1984.02.28 |  Argentina | Diocese of Resistencia was promoted as Metropolitan Archdiocese of Resistencia (with suffragan sees Formosa and Presidencia Roque Sáenz Peña) |
| 1984.03.08 |  Guam | Diocese of Agaña was promoted as Metropolitan Archdiocese of Agaña (with suffragan see Carolines–Marshalls) |
| 1984.03.14 |  Mexico | Diocese of Coatzacoalcos was established (from Diocese of San Andrés Tuxtla and became suffragan of Jalapa) |
| 1984.03.19 |  Italy | Archdiocese of Camerino lost territory to Diocese of Cingoli and Diocese of Fabriano |
| 1984.03.19 | Italy | Diocese of Città di Castello lost territory to Diocese of Cagli and Diocese of Cortona |
| 1984.03.19 | Italy | Diocese of Macerata exchanged territory with Diocese of Osimo |
| 1984.03.19 | Italy | Diocese of Nocera Umbra–Gualdo Tadino lost territory to Archdiocese of Camerino, Diocese of Fabriano, Diocese of Foligno, Diocese of Pergola and Diocese of Senigallia |
| 1984.03.19 | Italy | Diocese of Norcia lost territory to Archdiocese of Camerino |
| 1984.03.19 | Italy | Diocese of Osimo exchanged territory with Diocese of Macerata and Diocese of Recanati |
| 1984.03.19 | Italy | Diocese of Recanati exchanged territory with Diocese of Osimo |
| 1984.03.29 |  Colombia | Diocese of La Dorada–Guaduas was established (from Metropolitan Archdiocese of Manizales, Diocese of Barrancabermeja and Diocese of Facatativá and became suffragan of Manizales) |
| 1984.04.09 | Philippines | Diocese of Gumaca was established (from Diocese of Lucena and became suffragan of Lipa) |
| 1984.05.13 |  Portugal | Diocese of Leiria was renamed as Diocese of Leiria–Fátima |
| 1984.06.04 |  Mozambique | Diocese of Beira was promoted as Metropolitan Archdiocese of Beira (with suffragan sees Quelimane and Tete) |
| 1984.06.04 | Mozambique | Diocese of Nampula was promoted as Metropolitan Archdiocese of Nampula (with suffragan sees Lichinga and Pemba) |
| 1984.06.10 |  Turks and Caicos Islands | Mission sui juris of Turks and Caicos Islands was established (from Diocese of Nassau) |
| 1984.06.16 |  USA | Diocese of Palm Beach was established (from Metropolitan Archdiocese of Miami and Diocese of Orlando and became suffragan of Miami) |
| 1984.06.16 | USA | Diocese of Venice was established (from Metropolitan Archdiocese of Miami, Diocese of Orlando and Diocese of Saint Petersburg and became suffragan of Miami) |
| 1984.06.19 | India | Diocese of Gorakhpur (Syro-Malabar Rite) was established (from Diocese of Varanasi and became suffragan of Agra) |
| 1984.06.22 | India | Diocese of Port Blair was established (from Metropolitan Archdiocese of Ranchi and became suffragan of Ranchi) |
| 1984.07.02 |  Angola | Diocese of Cabinda was established (from Metropolitan Archdiocese of Luanda and became suffragan of Luanda) |
| 1984.07.02 |  Ecuador | Apostolic Prefecture of Aguarico was promoted as Apostolic Vicariate of Aguarico |
| 1984.07.02 | Ecuador | Apostolic Prefecture of San Miguel de Sucumbíos was promoted as Apostolic Vicariate of San Miguel de Sucumbíos |
| 1984.07.19 | Colombia | Apostolic Vicariate of Arauca was promoted as Diocese of Arauca (became suffragan of Nueva Pamplona) |
| 1984.08.11 |  Spain | Diocese of Albarracin was suppressed (to Diocese of Teruel y Albarracín) |
| 1984.08.11 | Spain | Metropolitan Archdiocese of Pamplona was renamed as Metropolitan Archdiocese of Pamplona y Tudela (gained territory from the suppressed Diocese of Tudela and lost suffragan see Tudela) |
| 1984.08.11 | Spain | Diocese of Teruel was renamed as Diocese of Teruel y Albarracín (gained territory from the suppressed Diocese of Albarracin) |
| 1984.08.11 | Spain | Diocese of Tudela was suppressed (to Metropolitan Archdiocese of Pamplona y Tudela) |
| 1984.09.15 | Italy | Metropolitan Archdiocese of Modena lost territory to Diocese of Reggio Emilia |
| 1984.10.09 | Brazil | Diocese of São José do Grajaú was renamed as Diocese of Grajaú |
| 1984.11.03 | Mexico | Diocese of Atlacomulco was established (from Diocese of Cuautitlán and Diocese of Toluca and became suffragan of México) |
| 1984.11.06 |  Syria | Patriarchal Exarchate of Damascus (Armenian Rite) was established |
| 1984.11.07 | Angola | Diocese of Mbanza Congo was restored (from Diocese of Uíje and became suffragan of Luanda) |
| 1984.11.08 |  Northern Mariana Islands | Diocese of Chalan Kanoa was restored (from Metropolitan Archdiocese of Agaña and became suffragan of Agaña) |
| 1984.11.08 |  Tanzania | Diocese of Geita was established (from Diocese of Mwanza and became suffragan of Tabora) |
| 1984.12.03 | India | Diocese of Udaipur was established (from Diocese of Ajmer–Jaipur and became suffragan of Agra) |
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