 | 1956 | 1957 | 1958 |  |
Date | Country | Change |
| 1957 |  Italy | Diocese of Priverno lost territory to Diocese of Terracina |
| 1957 |  São Tomé and Príncipe | Diocese of São Tomé was renamed as Diocese of São Tomé e Príncipe |
| 1957 |  Turkiye | Diocese of Gazireh (Syriac Rite) was suppressed |
| 1957 | Turkiye | Titular Archiepiscopal See of Tarsus (Armenian Rite) was suppressed |
| 1957 | Titular Episcopal See of Antigonea was suppressed | |
| 1957.01.04 |  Samoa | Apostolic Vicariate of Archipelago of the Navigators was renamed as Apostolic Vicariate of Samoa Island and Tokelau |
| 1957.01.18 |  Brazil | Territorial Prelature of Vacaria was promoted as Diocese of Vacaria (lost territory to Metropolitan Archdiocese of Porto Alegre) |
| 1957.01.19 |  Paraguay | Diocese of San Juan Bautista was established (from Metropolitan Archdiocese of Asunción and Diocese of Villarrica and became suffragan of Asunción) |
| 1957.01.21 | Paraguay | Territorial Prelature of Encarnación y Alto Paraná was established (from Diocese of Concepción and Diocese of Villarrica and became suffragan of Asunción) |
| 1957.01.21 |  Senegal | Apostolic Prefecture of Kaolack was established (from Metropolitan Archdiocese of Dakar and Diocese of Ziguinchor) |
| 1957.01.21 |  South Korea | Apostolic Vicariate of Busan 부산 was established (from Apostolic Vicariate of Taiku 대구) |
| 1957.01.21 | South Korea | Apostolic Prefecture of Gwangju 광주 was promoted as Apostolic Vicariate of Gwangju 광주 |
| 1957.01.26 | South Korea | Apostolic Prefecture of Jeonju 전주 was promoted as Apostolic Vicariate of Jeonju 전주 |
| 1957.02.11 |  Argentina | Diocese of Bahía Blanca was promoted as Metropolitan Archdiocese of Bahía Blanca (with suffragan sees Comodoro Rivadavia, Santa Rosa and Viedma and lost territory to establish Diocese of Mar del Plata and Diocese of Santa Rosa) |
| 1957.02.11 | Argentina | Diocese of Comodoro Rivadavia was established (from Diocese of Viedma and became suffragan of Bahía Blanca) |
| 1957.02.11 | Argentina | Diocese of Formosa was established (from Diocese of Resistencia and became suffragan of Santa Fe) |
| 1957.02.11 | Argentina | Diocese of Gualeguaychú was established (from Metropolitan Archdiocese of Paraná and became suffragan of Paraná) |
| 1957.02.11 | Argentina | Diocese of Lomas de Zamora was established (from Metropolitan Archdiocese of La Plata and became suffragan of La Plata) |
| 1957.02.11 | Argentina | Diocese of Mar del Plata was established (from Metropolitan Archdiocese of La Plata and Diocese of Bahía Blanca and became suffragan of La Plata) |
| 1957.02.11 | Argentina | Diocese of Mendoza lost territory to Diocese of Viedma |
| 1957.02.11 | Argentina | Diocese of Morón was established (from Metropolitan Archdiocese of La Plata and became suffragan of Buenos Aires) |
| 1957.02.11 | Argentina | Diocese of Nueve de Julio was established (from Diocese of Azul and Diocese of Mercedes and became suffragan of Buenos Aires) |
| 1957.02.11 | Argentina | Diocese of Posadas was established (from Diocese of Corrientes and became suffragan of La Plata) |
| 1957.02.11 | Argentina | Diocese of Reconquista was established (from Metropolitan Archdiocese of Santa Fe and became suffragan of Santa Fe) |
| 1957.02.11 | Argentina | Diocese of San Isidro was established (from Metropolitan Archdiocese of La Plata and Diocese of San Nicolás de los Arroyos and became suffragan of Buenos Aires) |
| 1957.02.11 | Argentina | Diocese of Santa Rosa was established (from Diocese of Bahía Blanca and Diocese of Mercedes and became suffragan of Bahía Blanca) |
| 1957.02.11 | Argentina | Diocese of Tucumán was promoted as Metropolitan Archdiocese of Tucumán (with suffragan see Santiago del Estero) |
| 1957.02.11 | Argentina | Diocese of Villa María was established (from Metropolitan Archdiocese of Córdoba and became suffragan of Córdoba) |
| 1957.02.15 |  Zimbabwe | Apostolic Prefecture of Umtali was promoted as Diocese of Umtali (became suffragan of Salisbury) |
| 1957.02.23 |  Germany | Diocese of Essen was established (from Metropolitan Archdiocese of Köln, Metropolitan Archdiocese of Paderborn and Diocese of Münster and became suffragan of Köln) |
| 1957.03.18 |  Colombia | Diocese of Espinal was established (from Diocese of Ibagué and became suffragan of Popayán) |
| 1957.03.18 | Colombia | Diocese of Sonsón was established (from Metropolitan Archdiocese of Medellín and became suffragan of Medellín) |
| 1957.03.22 |  Tonga | Apostolic Vicariate of Tonga Islands was renamed as Apostolic Vicariate of Tonga Islands and Niue |
| 1957.03.25 |  Portugal | Patriarchal See of Lisboa lost territory to Diocese of Leiria |
| 1957.04.05 |  Mozambique | Diocese of Porto Amélia was established (from Diocese of Nampula and became suffragan of Lourenço Marques) |
| 1957.04.06 |  USA | Diocese of Rockville Centre was established (from Diocese of Brooklyn and became suffragan of New York) |
| 1957.04.08 |  Madagascar | Diocese of Farafangana was established (from Diocese of Fort-Dauphin and became suffragan of Tananarive) |
| 1957.04.08 | Madagascar | Diocese of Tuléar was established (from Diocese of Fort-Dauphin and became suffragan of Tananarive) |
| 1957.04.09 |  Ecuador | Diocese of Cuenca was promoted as Metropolitan Archdiocese of Cuenca (with suffragan see Loja) |
| 1957.04.09 |  Spain | Diocese of Coria was renamed as Diocese of Coria–Cáceres |
| 1957.04.10 | Brazil | Territorial Prelature of Óbidos was established (from Territorial Prelature of Santarém and became suffragan of Belém do Pará) |
| 1957.04.10 |  Mexico | Diocese of Ciudad Juárez was established (from Diocese of Chihuahua and became suffragan of Durango) |
| 1957.04.12 |  Peru | Territorial Prelature of Yauyos was established (from Metropolitan Archdiocese of Lima and became suffragan of Lima) |
| 1957.04.13 | Mexico | Apostolic Prefecture of La Paz was established (from Apostolic Vicariate of California Inferiore and became suffragan of Durango) |
| 1957.04.16 |  Netherlands | Military Vicariate of Netherlands was established |
| 1957.04.28 |  France | Diocese of Fréjus was renamed as Diocese of Fréjus–Toulon |
| 1957.06.04 |  Venezuela | Diocese of Trujillo was established (from Metropolitan Archdiocese of Mérida and became suffragan of Mérida) |
| 1957.06.06 | Spain | Diocese of Barcelona lost territory to Metropolitan Archdiocese of Tarragona and Diocese of Vic |
| 1957.06.06 | Spain | Diocese of Cuenca lost territory to Metropolitan Archdiocese of Valencia |
| 1957.06.06 | Spain | Diocese of Gerona lost territory to Diocese of Vic |
| 1957.06.06 | Spain | Diocese of Lérida lost territory to Diocese of Solsona |
| 1957.06.06 | Spain | Diocese of Orihuela exchanged territory with Metropolitan Archdiocese of Valencia |
| 1957.06.06 | Spain | Diocese of Segorbe exchanged territory with Metropolitan Archdiocese of Valencia |
| 1957.06.06 | Spain | Diocese of Solsona exchanged territory with Diocese of Vic |
| 1957.06.06 | Spain | Metropolitan Archdiocese of Valencia exchanged territory with Diocese of Orihuela and Diocese of Segorbe |
| 1957.06.06 | Spain | Diocese of Vic lost territory to Metropolitan Archdiocese of Tarragona |
| 1957.06.10 |  England,  Scotland,  Wales | Apostolic Exarchate of England and Wales (Ukrainian Rite) was established |
| 1957.06.15 | Brazil | Diocese of Campo Grande was established (from Diocese of Corumbá and Territorial Prelature of Registro do Araguaia and became suffragan of Cuiabá) |
| 1957.06.15 | Brazil | Diocese of Dourados was established (from Diocese of Corumbá and became suffragan of Cuiabá) |
| 1957.06.15 | Brazil | Diocese of Januária was established (from Diocese of Montes Claros and Territorial Prelature of Paracatu and became suffragan of Diamantina) |
| 1957.06.19 | Mexico | Diocese of Tapachula was established (from Diocese of Chiapas and became suffragan of Antequera) |
| 1957.06.19 | Mexico | Diocese of Torreón was established (from Diocese of Saltillo and became suffragan of Durango) |
| 1957.06.20 |  India | Diocese of Visakhapatnam lost territory to Diocese of Cuttack |
| 1957.06.24 |  Gambia | Apostolic Prefecture of Bathurst in Gambia was promoted as Diocese of Bathurst in Gambia (without ecclesiastical province) |
| 1957.06.28 |  Congo-Kinshasa | Apostolic Prefecture of Bikoro was promoted as Apostolic Vicariate of Bikoro |
| 1957.07.03 |  Lebanon | Diocese of Beirut (Chaldean Rite) was established (from the suppressed Apostolic Administration of Upper Gazireh and without ecclesiastical province) |
| 1957.07.03 |  Syria | Diocese of Syria (Chaldean Rite) was renamed as Diocese of Aleppo (gained territory from the suppressed Apostolic Administration of Upper Gazireh) |
| 1957.07.03 | Turkiye | Apostolic Administration of Upper Gazireh (Chaldean Rite) was suppressed (to Diocese of Aleppo and Diocese of Diarbekir and to establish Diocese of Beirut) |
| 1957.07.05 | Congo-Kinshasa | Apostolic Prefecture of Kenge was established (from Apostolic Vicariate of Kikwit and Apostolic Vicariate of Kisantu) |
| 1957.07.05 |  Papua New Guinea | Apostolic Vicariate of Kavieng was established (from Apostolic Vicariate of Rabaul) |
| 1957.07.05 |  Tanzania | Apostolic Prefecture of Musoma was promoted as Diocese of Musoma (became suffragan of Tabora) |
| 1957.07.05 |  Vietnam | Apostolic Vicariate of Nha Trang was established (from Apostolic Vicariate of Quinhon and Apostolic Vicariate of Saigon) |
| 1957.07.08 | Argentina,  Antarctica | Military Vicariate of Argentina was established |
| 1957.07.09 | Italy | Diocese of Aversa exchanged territory with Diocese of Pozzuoli |
| 1957.07.09 | Italy | Diocese of Pozzuoli exchanged territory with Diocese of Aversa |
| 1957.07.10 | Spain | Diocese of Cartagena lost territory to Diocese of Almería |
| 1957.07.10 | Spain | Metropolitan Archdiocese of Granada lost territory to Diocese of Almería |
| 1957.07.10 | Spain | Diocese of Guadix lost territory to Diocese of Almería |
| 1957.07.10 | Spain | Diocese of Málaga lost territory to Metropolitan Archdiocese of Granada |
| 1957.07.13 | Mexico | Apostolic Vicariate of California Inferiore was renamed as Apostolic Vicariate of Tijuana |
| 1957.07.15 | Syria | Diocese of Hassaké (Syriac Rite) was established (without ecclesiastical province) |
| 1957.07.27 | Brazil | Diocese of Vitória da Conquista was established (from Diocese of Amargosa and became suffragan of São Salvador da Bahia) |
| 1957.08.03 | Peru | Territorial Prelature of Juli was established (from Diocese of Puno and became suffragan of Arequipa) |
| 1957.09.07 |  Belgium | Military Vicariate of Belgium was established |
| 1957.09.08 | USA, Antarctica,  U.S. Minor Islands | Military Vicariate of United States of America was established |
| 1957.09.19 |  Myanmar | Apostolic Prefecture of Akyab was renamed as Apostolic Prefecture of Prome |
| 1957.10.09 | USA | Diocese of Altoona was renamed as Diocese of Altoona–Johnstown |
| 1957.10.31 |  Chile | Territorial Prelature of Copiapó was promoted as Diocese of Copiapó |
| 1957.11.14 | Ecuador | Apostolic Prefecture of Esmeraldas was promoted as Apostolic Vicariate of Esmeraldas |
| 1957.11.14 | Ecuador | Apostolic Prefecture of Galápagos was established (from Metropolitan Archdiocese of Guayaquil) |
| 1957.11.18 | USA | Diocese of New Ulm was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
| 1957.11.21 | Peru | Territorial Prelature of Caravelí was established (from Metropolitan Archdiocese of Arequipa and Diocese of Ayacucho and became suffragan of Arequipa) |
| 1957.11.25 |  Angola | Diocese of Malanje was established (from Metropolitan Archdiocese of Luanda and Diocese of Silva Porto and became suffragan of Luanda) |
| 1957.11.25 | Brazil | Diocese of São Carlos do Pinhal was renamed as Diocese of São Carlos |
| 1957.12.16 |  Japan | Apostolic Prefecture of Urawa 浦和 was promoted as Diocese of Urawa 浦和 |
| 1957.12.29 | Ecuador | Metropolitan Archdiocese of Cuenca lost territory to Diocese of Riobamba |
| 1957.12.29 | Ecuador | Diocese of Guaranda was established (from Diocese of Riobamba and became suffragan of Cuenca) |
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