 | 1953 | 1954 | 1955 |  |
Date | Country | Change |
| 1954 |  Egypt | Titular Metropolitan See of Nubia was established |
| 1954 |  Spain | Diocese of Segovia lost territory to Metropolitan Archdiocese of Burgos |
| 1954 | Spain | Metropolitan Archdiocese of Toledo (Mozarabic Rite) exchanged territory with Diocese of Ávila |
| 1954 | Spain | Diocese of Ávila lost territory to Metropolitan Archdiocese of Valladolid |
| 1954.01.06 |  Congo-Kinshasa | Apostolic Vicariate of Costermansville was renamed as Apostolic Vicariate of Bukavu |
| 1954.01.17 |  Iraq | Archdiocese of Bassorah (Chaldean Rite) was restored (from Metropolitan Archdiocese of Baghdad and without ecclesiastical province) |
| 1954.02.11 |  Philippines | Diocese of Lingayen was renamed as Diocese of Lingayen–Dagupan |
| 1954.02.21 |  South Africa | Diocese of Umzimkulu was established (from Diocese of Mariannhill and became suffragan of Durban) |
| 1954.02.22 |  Italy | Diocese of Gerace was renamed as Diocese of Gerace–Locri |
| 1954.04.05 |  Benin | Apostolic Vicariate of Porto Novo was established (from Apostolic Vicariate of Ouidah) |
| 1954.04.05 |  Colombia | Apostolic Prefecture of Guapi was established (from Apostolic Prefecture of Tumaco) |
| 1954.04.05 | Italy | Diocese of Porto e Santa Rufina lost territory to Papal See of Roma |
| 1954.04.08 | Colombia | Diocese of Jericó lost territory to Apostolic Vicariate of Quibdó |
| 1954.04.16 |  Syria | Apostolic Administration of Latakia (Maronite Rite) was established (from Archdiocese of Tripoli) |
| 1954.04.23 | Spain | Metropolitan Archdiocese of Toledo (Mozarabic Rite) lost territory to Diocese of Jaén |
| 1954.04.30 |  USA | Diocese of Mobile was renamed as Diocese of Mobile–Birmingham |
| 1954.05.10 | Colombia | Diocese of Manizales was promoted as Metropolitan Archdiocese of Manizales (with suffragan sees Armenia and Pereira) |
| 1954.06.07 |  Venezuela | Diocese of Barcelona was established (from Diocese of Ciudad Bolívar and became suffragan of Caracas) |
| 1954.06.07 | Venezuela | Diocese of Guanare was established (from Diocese of Barquisimeto and Diocese of Calabozo and became suffragan of Caracas) |
| 1954.06.07 | Venezuela | Territorial Prelature of San Fernando de Apure was established (from Diocese of Calabozo and Diocese of San Cristóbal de Venezuela and became suffragan of Caracas) |
| 1954.06.14 |  Burkina Faso | Apostolic Vicariate of Koudougou was established (from the suppressed Apostolic Prefecture of Ouahigouya) |
| 1954.06.14 | Burkina Faso | Apostolic Prefecture of Ouahigouya was suppressed (to establish Apostolic Vicariate of Koudougou) |
| 1954.06.14 |  Central African Republic | Apostolic Prefecture of Bangassou was established (from Apostolic Vicariate of Bangui) |
| 1954.06.14 |  Indonesia | Apostolic Prefecture of Hollandia was promoted as Apostolic Vicariate of Hollandia |
| 1954.06.14 | Indonesia | Apostolic Prefecture of Ketapang was established (from Apostolic Vicariate of Pontianak) |
| 1954.06.14 |  Sri Lanka | Diocese of Kandy lost territory to Diocese of Trincomalee |
| 1954.06.16 |  France | Ordinariate of Ordinariat des catholiques de rite oriental résidant en France (Eastern Rite) was established |
| 1954.06.25 | Spain | Diocese of Cartagena lost territory to Diocese of Orihuela |
| 1954.06.29 | Iraq | Archdiocese of Baghdad (Armenian Rite) was established (from Archdiocese of Mardin and without ecclesiastical province) |
| 1954.06.29 | Syria | Diocese of Kameshli (Armenian Rite) was established (from Archdiocese of Mardin and became suffragan of Cilicia) |
| 1954.07.02 | Italy | Archdiocese of Matera was promoted as Metropolitan Archdiocese of Matera (with suffragan sees Anglona–Tursi and Tricarico and gained title of San Michele Arcangelo di Montescaglioso) |
| 1954.07.05 |  India | Metropolitan Archdiocese of Agra lost territory to Diocese of Jhansi |
| 1954.07.05 | India | Apostolic Prefecture of Jabalpur was promoted as Diocese of Jabalpur |
| 1954.07.05 | India | Apostolic Prefecture of Jhansi was promoted as Diocese of Jhansi (gained territory from Metropolitan Archdiocese of Agra) |
| 1954.07.05 |  Western Sahara | Apostolic Prefecture of Sahara Español e Ifni was established (from Apostolic Vicariate of Ghardaïa nel Sahara and Apostolic Vicariate of Marruecos) |
| 1954.07.18 |  Brazil | Diocese of Santo André was established (from Metropolitan Archdiocese of São Paulo and became suffragan of São Paulo) |
| 1954.07.26 |  Ecuador | Territorial Prelature of El Oro was established (from Diocese of Guayaquil and Diocese of Loja and became suffragan of Quito) |
| 1954.07.27 | Italy | Diocese of Volterra lost territory to Metropolitan Archdiocese of Siena |
| 1954.07.30 | Venezuela | Apostolic Vicariate of Tucupita was established (from Apostolic Vicariate of Caroní) |
| 1954.08.15 | France | Territorial Prelature of Mission de France was established (from Metropolitan Archdiocese of Sens and became suffragan of Sens) |
| 1954.08.19 |  Costa Rica | Diocese of San Isidro de El General was established (from Metropolitan Archdiocese of San José and Diocese of Alajuela and became suffragan of San José) |
| 1954.10.06 |  Mozambique | Diocese of Quelimane was established (from Diocese of Beira and became suffragan of Lourenço Marques) |
| 1954.10.17 | Spain | Diocese of Astorga lost territory to Diocese of León and Diocese of Zamora |
| 1954.10.17 | Spain | Metropolitan Archdiocese of Burgos lost territory to Diocese of Santander |
| 1954.10.17 | Spain | Diocese of León lost territory to Metropolitan Archdiocese of Valladolid, Diocese of Santander and Diocese of Zamora |
| 1954.10.17 | Spain | Diocese of Lugo exchanged territory with Diocese of Astorga, Diocese of Mondoñedo and Diocese of Ourense |
| 1954.10.17 | Spain | Diocese of Mondoñedo lost territory to Metropolitan Archdiocese of Santiago de Compostela |
| 1954.10.17 | Spain | Diocese of Ourense lost territory to Diocese of Astorga |
| 1954.10.17 | Spain | Diocese of Oviedo lost territory to Diocese of Astorga, Diocese of León, Diocese of Lugo and Diocese of Mondoñedo |
| 1954.10.17 | Spain | Diocese of Palencia lost territory to Metropolitan Archdiocese of Valladolid and Diocese of Santander |
| 1954.10.17 | Spain | Diocese of Santander lost territory to Diocese of Oviedo |
| 1954.10.17 | Spain | Metropolitan Archdiocese of Santiago de Compostela lost territory to Diocese of Ourense |
| 1954.10.17 | Spain | Diocese of Tui lost territory to Diocese of Ourense |
| 1954.10.27 | Spain | Diocese of Oviedo was promoted as Metropolitan Archdiocese of Oviedo (with suffragan sees Astorga, León and Santander) |
| 1954.11.12 |  Australia | Diocese of Bunbury was established (from Metropolitan Archdiocese of Perth and became suffragan of Perth) |
| 1954.11.16 | Italy | Diocese of Noto lost territory to Diocese of Ragusa |
| 1954.11.20 | Colombia | Diocese of Montería was established (from Metropolitan Archdiocese of Cartagena and Apostolic Vicariate of San Jorge and became suffragan of Cartagena) |
| 1954.12.02 |  El Salvador | Diocese of Santiago de María was established (from Diocese of San Miguel and became suffragan of San Salvador) |
| 1954.12.02 |  Kuwait,  Bahrain,  Qatar,  Saudi Arabia | Apostolic Prefecture of Kuwait was promoted as Apostolic Vicariate of Kuwait |
| 1954.12.20 | Brazil | Territorial Prelature of Santo Antônio de Balsas was established (from Diocese of Caxias do Maranhão and became suffragan of São Luís do Maranhão) |
| 1954.12.20 | Brazil | Territorial Prelature of Tocantinópolis was established (from Diocese of Porto Nacional and became suffragan of Goiás) |
| 1954.12.28 | Brazil | Diocese of Tubarão was established (from Metropolitan Archdiocese of Florianópolis and became suffragan of Florianópolis) |
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