 | 1963 | 1964 | 1965 |  |
Date | Country | Change |
| 1964 |  Denmark | Titular Episcopal See of Roskilde was suppressed |
| 1964 |  Egypt | Titular Patriarchal See of Alexandria was suppressed |
| 1964 |  Turkiye | Titular Patriarchal See of Antioch was suppressed |
| 1964 | Turkiye | Titular Patriarchal See of Constantinople was suppressed |
| 1964.01.13 |  Mexico | Diocese of Tlalnepantla was established (from Metropolitan Archdiocese of México and Diocese of Texcoco and became suffragan of México) |
| 1964.01.16 |  Central African Republic | Apostolic Prefecture of Bossangoa was promoted as Diocese of Bossangoa (became suffragan of Bangui) |
| 1964.01.16 |  Chad | Apostolic Prefecture of Pala was promoted as Diocese of Pala (became suffragan of Fort-Lamy) |
| 1964.01.16 |  Colombia | Apostolic Prefecture of Ariari was established (from Apostolic Vicariate of Villavicencio) |
| 1964.01.16 |  India | Apostolic Prefecture of Raipur was established (from Metropolitan Archdiocese of Nagpur) |
| 1964.01.16 | India | Diocese of Tezpur was established (from Diocese of Darjeeling, Diocese of Dibrugarh and Diocese of Shillong and became suffragan of Calcutta) |
| 1964.01.20 |  Brazil | Diocese of Januária lost territory to Diocese of Paracatu |
| 1964.01.20 |  Kenya | Military Vicariate of Kenya was established |
| 1964.01.20 |  Uganda | Military Vicariate of Uganda was established |
| 1964.02.10 |  Benin | Diocese of Natitingou was established (from Apostolic Prefecture of Parakou and became suffragan of Cotonou) |
| 1964.02.10 | Benin | Apostolic Prefecture of Parakou was promoted as Diocese of Parakou (lost territory to establish Diocese of Natitingou and became suffragan of Cotonou) |
| 1964.02.10 | Central African Republic | Apostolic Prefecture of Bangassou was promoted as Diocese of Bangassou (became suffragan of Bangui) |
| 1964.02.11 | Colombia | Apostolic Vicariate of Villavicencio was promoted as Diocese of Villavicencio (became suffragan of Bogotá) |
| 1964.02.15 | Brazil | Diocese of Bauru was established (from Metropolitan Archdiocese of Botucatu and Diocese of Lins and became suffragan of Botucatu) |
| 1964.02.15 | Brazil | Diocese of Floresta was restored (from Diocese of Pesqueira and Diocese of Petrolina and became suffragan of Olinda e Recife) |
| 1964.02.25 | Colombia | Diocese of Garzón was renamed as Diocese of Garzón–Neiva |
| 1964.03.02 |  Argentina | Metropolitan Archdiocese of La Plata lost territory to Diocese of Avellaneda and Diocese of Lomas de Zamora |
| 1964.03.04 |  Peru | Territorial Prelature of Chulucanas was established (from Diocese of Piura and became suffragan of Trujillo) |
| 1964.03.10 |  Nigeria | Diocese of Warri was established (from Diocese of Benin City and became suffragan of Lagos) |
| 1964.03.25 |  Spain | Diocese of Barcelona was promoted as Archdiocese of Barcelona |
| 1964.03.25 | Spain | Diocese of Madrid y Alcalá de Henares was promoted as Archdiocese of Madrid (without ecclesiastical province) |
| 1964.04.21 |  Tanzania | Diocese of Mahenge was established (from Metropolitan Archdiocese of Dar-es-Salaam and became suffragan of Dar-es-Salaam) |
| 1964.05.12 | India | Diocese of Simla was renamed as Diocese of Simla and Chandigarh |
| 1964.06.12 |  Indonesia | Apostolic Vicariate of Kota Baru was renamed as Apostolic Vicariate of Sukarnapura |
| 1964.06.16 |  Burkina Faso | Apostolic Prefecture of Fada N’Gourma was promoted as Diocese of Fada N’Gourma (became suffragan of Ouagadougou) |
| 1964.06.16 | Nigeria | Apostolic Prefecture of Sokoto was promoted as Diocese of Sokoto (became suffragan of Kaduna) |
| 1964.06.20 | Colombia | Diocese of Cali was promoted as Metropolitan Archdiocese of Cali (with suffragan sees Cartago and Palmira) |
| 1964.06.20 | Colombia | Diocese of Tunja was promoted as Metropolitan Archdiocese of Tunja (with suffragan see Duitama) |
| 1964.07.06 |  Italy | Diocese of Brixen was renamed as Diocese of Bolzano–Bressanone (gained territory from Archdiocese of Trento and lost territory to Diocese of Belluno) |
| 1964.07.06 | Italy | Archdiocese of Trento was promoted as Metropolitan Archdiocese of Trento (lost territory to Diocese of Bolzano–Bressanone) |
| 1964.07.06 | Nigeria | Apostolic Prefecture of Kabba was promoted as Diocese of Kabba (became suffragan of Kaduna) |
| 1964.07.09 |  Tunisia | Metropolitan Archdiocese of Carthage was suppressed (to establish Territorial Prelature of Tunis) |
| 1964.07.09 | Tunisia | Territorial Prelature of Tunis was restored (from the suppressed Metropolitan Archdiocese of Carthage and without ecclesiastical province) |
| 1964.08.06 |  Austria | Apostolic Administration of Innsbruck–Feldkirch was promoted as Diocese of Innsbruck–Feldkirch (became suffragan of Salzburg) |
| 1964.09.08 |  Honduras | Territorial Prelature of Choluteca was established (from Metropolitan Archdiocese of Tegucigalpa and became suffragan of Tegucigalpa) |
| 1964.09.13 |  South Africa | Diocese of Lydenburg was renamed as Diocese of Lydenburg–Witbank |
| 1964.09.23 | Colombia | Diocese of Ipiales was established (from Diocese of Pasto, Apostolic Vicariate of Sibundoy and Apostolic Vicariate of Tumaco and became suffragan of Popayán) |
| 1964.09.23 | Colombia | Apostolic Vicariate of Sibundoy lost territory to Diocese of Pasto |
| 1964.09.29 |  Congo-Kinshasa | Apostolic Prefecture of Mweka was promoted as Diocese of Mweka (became suffragan of Luluabourg) |
| 1964.09.29 |  Ecuador | Apostolic Prefecture of Canelos was promoted as Apostolic Vicariate of Canelos |
| 1964.09.29 |  Mali | Apostolic Prefecture of Gao was promoted as Diocese of Mopti (became suffragan of Bamako) |
| 1964.09.29 | Mali | Mission sui juris of San was promoted as Diocese of San (became suffragan of Bamako) |
| 1964.09.29 |  Togo | Diocese of Atakpamé was established (from Metropolitan Archdiocese of Lomé and became suffragan of Lomé) |
| 1964.10.09 |  Burundi | Diocese of Usumbura was renamed as Diocese of Bujumbura |
| 1964.10.27 | Mexico | Diocese of Ciudad Altamirano was established (from Diocese of Acapulco, Diocese of Chilapa, Diocese of Tacámbaro and Diocese of Toluca and became suffragan of Morelia) |
| 1964.10.27 | Mexico | Diocese of Chiapas was renamed as Diocese of San Cristóbal de Las Casas (lost territory to establish Diocese of Tuxtla Gutiérrez) |
| 1964.10.27 | Mexico | Diocese of Tuxtla Gutiérrez was established (from Diocese of Chiapas, Diocese of Tabasco and Diocese of Tapachula and became suffragan of Antequera) |
| 1964.10.30 |  Canada | Diocese of Harbour Grace–Grand Falls was renamed as Diocese of Grand Falls |
| 1964.11.04 |  Puerto Rico | Diocese of Caguas was established (from Metropolitan Archdiocese of San Juan de Puerto Rico and Diocese of Ponce and became suffragan of San Juan de Puerto Rico) |
| 1964.11.09 | Nigeria | Apostolic Prefecture of Minna was established (from Metropolitan Archdiocese of Kaduna) |
| 1964.11.18 |  Israel | Diocese of Akka (Greek-Melkite Rite) was promoted as Archdiocese of Akka |
| 1964.11.18 |  Lebanon | Diocese of Baalbek (Greek-Melkite Rite) was promoted as Archdiocese of Baalbek |
| 1964.11.18 | Lebanon | Diocese of Bāniyās (Greek-Melkite Rite) was promoted as Archdiocese of Bāniyās |
| 1964.11.18 | Lebanon | Diocese of Saïdā (Greek-Melkite Rite) was promoted as Archdiocese of Saïdā |
| 1964.11.18 | Lebanon | Diocese of Tripoli (Greek-Melkite Rite) was promoted as Archdiocese of Tripoli |
| 1964.11.18 | Lebanon | Diocese of Zahleh–Furzol (Greek-Melkite Rite) was promoted as Archdiocese of Zahleh–Furzol |
| 1964.11.25 | Congo-Kinshasa | Diocese of Budjala was established (from Diocese of Lisala and became suffragan of Coquilhatville) |
| 1964.11.25 | Kenya | Diocese of Marsabit was established (from Diocese of Nyeri and became suffragan of Nairobi) |
| 1964.11.28 | Brazil | Diocese of Apucarana was established (from Diocese of Campo Mourão and Diocese of Londrina and became suffragan of Curitiba) |
| 1964.12.03 |  Syria | Diocese of Hassaké (Syriac Rite) was promoted as Archdiocese of Hassaké–Nisibi |
| 1964.12.12 | Kenya | Diocese of Mombasa and Zanzibar was renamed as Diocese of Mombasa (lost territory to establish Apostolic Administration of Zanzibar and Pemba) |
| 1964.12.12 | Tanzania | Apostolic Administration of Zanzibar and Pemba was restored (from Metropolitan Archdiocese of Dar-es-Salaam and Diocese of Mombasa and Zanzibar) |
| 1964.12.21 | Mexico | Diocese of Ciudad Victoria was established (from Diocese of Matamoros and Diocese of Tampico and became suffragan of Monterrey) |
| 1964.12.21 | Mexico | Territorial Prelature of Mixes was established (from Diocese of Tehuantepec and became suffragan of Antequera) |
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