 | 1962 | 1963 | 1964 |  |
Date | Country | Change |
| 1963 |  Syria | Titular Metropolitan See of Apamea in Syria (Syriac Rite) was established |
| 1963 |  Turkiye | Titular Metropolitan See of Amida (Syriac Rite) was restored |
| 1963 | Turkiye | Titular Episcopal See of Batnæ (Syriac Rite) was restored |
| 1963.01.06 |  Croatia | Diocese of Rijeka–Opatija lost territory to Diocese of Krk |
| 1963.01.06 | Croatia | Archdiocese of Zadar lost territory to Diocese of Krk |
| 1963.01.10 |  Chile | Diocese of Chillán lost territory to Diocese of Linares |
| 1963.01.10 | Chile | Diocese of Talca lost territory to Diocese of Linares |
| 1963.01.18 |  Cameroon | Diocese of Sangmélima was established (from Diocese of Douala and became suffragan of Yaoundé) |
| 1963.01.18 |  Nigeria | Apostolic Prefecture of Oyo was promoted as Diocese of Oyo (became suffragan of Lagos) |
| 1963.01.18 |  Vietnam | Diocese of Đà Nang was established (from Diocese of Quy Nhon and became suffragan of Huê) |
| 1963.02.16 |  Philippines | Diocese of Cabanatuan was established (from Diocese of Lingayen–Dagupan and Diocese of San Fernando and became suffragan of Lingayen–Dagupan) |
| 1963.02.16 | Philippines | Diocese of Lingayen–Dagupan was promoted as Metropolitan Archdiocese of Lingayen–Dagupan (with suffragan sees Cabanatuan and Tarlac and lost territory to establish Diocese of Cabanatuan and Diocese of Tarlac) |
| 1963.02.16 | Philippines | Diocese of Tarlac was established (from Diocese of Lingayen–Dagupan and Diocese of San Fernando and became suffragan of Lingayen–Dagupan) |
| 1963.03.01 |  Laos | Apostolic Vicariate of Luang Prabang was established (from Apostolic Vicariate of Vientiane) |
| 1963.03.01 | Nigeria | Diocese of Ikot Ekpene was established (from Diocese of Calabar and became suffragan of Onitsha) |
| 1963.03.01 |  Tanzania | Diocese of Arusha was established (from Diocese of Moshi and became suffragan of Dar-es-Salaam) |
| 1963.03.01 |  Zimbabwe | Apostolic Prefecture of Wankie was promoted as Diocese of Wankie (became suffragan of Salisbury) |
| 1963.03.13 |  Honduras | Diocese of Comayagua was restored (from Metropolitan Archdiocese of Tegucigalpa and became suffragan of Tegucigalpa) |
| 1963.04.05 |  Benin | Diocese of Abomey was established (from Metropolitan Archdiocese of Cotonou and Diocese of Porto Novo and became suffragan of Cotonou) |
| 1963.04.07 |  Peru | Territorial Prelature of Chota was established (from Diocese of Chiclayo and became suffragan of Trujillo) |
| 1963.04.22 |  Austria | Diocese of Seckau was renamed as Diocese of Graz–Seckau |
| 1963.04.27 |  Canada | Diocese of Hull was established (from Metropolitan Archdiocese of Ottawa and became suffragan of Ottawa) |
| 1963.04.29 |  Brazil | Territorial Prelature of Rio Branco was renamed as Territorial Prelature of Roraima |
| 1963.05.10 | Chile | Diocese of Puerto Montt was promoted as Metropolitan Archdiocese of Puerto Montt (with suffragan sees Osorno, Punta Arenas, San Carlos de Ancud and Aysén and lost territory to Metropolitan Archdiocese of Santiago) |
| 1963.06.25 | Brazil | Territorial Prelature of Ponta de Pedras was established (from Metropolitan Archdiocese of Belém do Pará and became suffragan of Belém do Pará) |
| 1963.06.28 |  Indonesia | Apostolic Vicariate of Hollandia was renamed as Apostolic Vicariate of Kota Baru |
| 1963.07.01 |  Angola | Diocese of Luso was established (from Diocese of Silva Porto and became suffragan of Luanda) |
| 1963.07.06 |  Congo-Kinshasa | Apostolic Prefecture of Kenge was promoted as Diocese of Kenge (became suffragan of Léopoldville) |
| 1963.07.06 | Honduras | Apostolic Vicariate of San Pedro Sula was promoted as Diocese of San Pedro Sula |
| 1963.07.06 |  Mali | Apostolic Prefecture of Kayes was promoted as Diocese of Kayes (became suffragan of Bamako) |
| 1963.07.06 | Mali | Apostolic Prefecture of Sikasso was promoted as Diocese of Sikasso (became suffragan of Bamako) |
| 1963.07.06 |  USA | Diocese of Passaic (Ruthenian Rite) was established (from Apostolic Exarchate of United States of America) |
| 1963.07.06 | USA | Apostolic Exarchate of United States of America (Ruthenian Rite) was promoted as Diocese of Pittsburgh (lost territory to establish Diocese of Passaic) |
| 1963.07.13 | Brazil | Territorial Prelature of Borba was established (from Metropolitan Archdiocese of Manaus and Territorial Prelature of Parintins and became suffragan of Manaus) |
| 1963.07.13 | Brazil | Territorial Prelature of Coari was established (from Metropolitan Archdiocese of Manaus and became suffragan of Manaus) |
| 1963.07.13 | Brazil | Territorial Prelature of Itacoatiara was established (from Metropolitan Archdiocese of Manaus and became suffragan of Manaus) |
| 1963.07.13 |  Mexico | Diocese of Hermosillo was promoted as Metropolitan Archdiocese of Hermosillo (with suffragan sees Ciudad Obregón, Tijuana and La Paz) |
| 1963.07.13 | Mexico | Apostolic Vicariate of Tijuana was promoted as Diocese of Tijuana (became suffragan of Hermosillo) |
| 1963.07.13 |  Panama | Diocese of Santiago de Veraguas was established (from Metropolitan Archdiocese of Panamá and became suffragan of Panamá) |
| 1963.07.15 |  Taiwan | Apostolic Prefecture of Hualien 花蓮 was promoted as Diocese of Hualien 花蓮 |
| 1963.07.21 |  Mozambique | Diocese of Vila Cabral was established (from Diocese of Nampula and became suffragan of Lourenço Marques) |
| 1963.08.05 | Tanzania | Diocese of Nachingwea was established (from Territorial Abbacy of Ndanda and became suffragan of Dar-es-Salaam) |
| 1963.08.12 |  Argentina | Diocese of Concepción was established (from Metropolitan Archdiocese of Tucumán and became suffragan of Tucumán) |
| 1963.08.12 | Argentina | Diocese of Cruz del Eje was established (from Metropolitan Archdiocese of Córdoba and became suffragan of Córdoba) |
| 1963.08.12 | Argentina | Diocese of Presidencia Roque Sáenz Peña was established (from Diocese of Resistencia and became suffragan of Corrientes) |
| 1963.08.12 | Argentina | Diocese of Rosario was promoted as Metropolitan Archdiocese of Rosario (with suffragan sees San Nicolás de los Arroyos and Venado Tuerto and lost territory to establish Diocese of Venado Tuerto) |
| 1963.08.12 | Argentina | Diocese of Venado Tuerto was established (from Diocese of Rosario and became suffragan of Rosario) |
| 1963.09.13 |  Cote d’Ivoire | Diocese of Abengourou was established (from Metropolitan Archdiocese of Abidjan, Diocese of Bouaké and Diocese of Katiola and became suffragan of Abidjan) |
| 1963.09.13 |  India | Metropolitan Archdiocese of Bhopal was established (from Diocese of Ajmer–Jaipur, Diocese of Indore and Diocese of Jabalpur and with suffragan sees Indore and Jabalpur) |
| 1963.09.13 |  Japan | Apostolic Prefecture of Shikoku 四国 was promoted as Diocese of Takamatsu 高松 |
| 1963.09.13 |  Papua New Guinea | Apostolic Prefecture of Vanimo was established (from Apostolic Vicariate of Aitape) |
| 1963.09.28 | Brazil | Diocese of Crateús was established (from Diocese of Iguatu and Diocese of Sobral and became suffragan of Fortaleza) |
| 1963.10.07 |  South Korea | Diocese of Suwon 수원 was established (from Metropolitan Archdiocese of Seoul 서울 and became suffragan of Seoul 서울) |
| 1963.10.12 | Philippines | Territorial Prelature of Isabela was established (from Metropolitan Archdiocese of Zamboanga and became suffragan of Zamboanga) |
| 1963.10.15 | Mexico | Diocese of Ciudad Juárez lost territory to Metropolitan Archdiocese of Chihuahua |
| 1963.11.12 |  Rwanda | Diocese of Astrida was renamed as Diocese of Butare |
| 1963.11.16 | India | Diocese of Chikmagalur was established (from Diocese of Mysore and became suffragan of Bangalore) |
| 1963.11.16 |  Kenya | Apostolic Prefecture of Kitui was promoted as Diocese of Kitui (became suffragan of Nairobi) |
| 1963.11.18 | Croatia | Diocese of Bosnia i Srijem was renamed as Diocese of Đakovo i Srijem |
| 1963.11.22 | Congo-Kinshasa | Apostolic Administration of Mbuji-Mayi was established (from Metropolitan Archdiocese of Luluabourg and Diocese of Kabinda) |
| 1963.11.26 | Laos | Apostolic Vicariate of Thakhek was renamed as Apostolic Vicariate of Savannakhet |
| 1963.12.05 |  Ecuador | Diocese of Latacunga was established (from Metropolitan Archdiocese of Quito and became suffragan of Quito) |
| 1963.12.10 | Tanzania | Apostolic Prefecture of Same was established (from Diocese of Moshi) |
| 1963.12.16 |  Italy | Diocese of Nicotera lost territory to Archdiocese of Cosenza |
| 1963.12.23 |  Ukraine | Metropolitanate sui juris of Lviv–Halyč–Kamyanets (Ukrainian Rite) was promoted as Major Archdiocese of Lviv–Halyč–Kamyanets |
| 1963.12.31 | Italy | Diocese of Tropea lost territory to Archdiocese of Cosenza and Diocese of Nicastro |
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