 | 1978 | 1979 | 1980 |  |
Date | Country | Change |
| 1979 |  South Africa | Diocese of Oudtshoorn lost territory to Diocese of Keimoes |
| 1979 |  Turkiye | Titular Episcopal See of Dara Syrorum (Syriac Rite) was restored |
| 1979.01.08 |  Cuba | Diocese of Holguín was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1979.01.08 |  Mexico | Diocese of Tuxtepec was established (from Territorial Prelature of Huautla and became suffragan of Antequera) |
| 1979.01.15 |  Italy | Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Pavia |
| 1979.01.21 | Italy | Diocese of Lodi exchanged territory with Diocese of Pavia |
| 1979.01.21 | Italy | Diocese of Pavia exchanged territory with Diocese of Lodi |
| 1979.02.05 | Mexico | Diocese of Cuautitlán was established (from Diocese of Texcoco and Diocese of Tlalnepantla and became suffragan of México) |
| 1979.02.05 | Mexico | Diocese of Nezahualcóyotl was established (from Diocese of Texcoco and became suffragan of México) |
| 1979.03.03 |  Bulgaria | Titular Metropolitan See of Serdica was suppressed (to Diocese of Sofia–Plovdiv) |
| 1979.03.03 | Bulgaria | Apostolic Vicariate of Sofia–Plovdiv was promoted as Diocese of Sofia–Plovdiv (gained territory from the suppressed Titular Metropolitan See of Serdica and without ecclesiastical province) |
| 1979.03.15 |  Ethiopia | Apostolic Prefecture of Awasa was promoted as Apostolic Vicariate of Awasa |
| 1979.03.28 |  Norway,  Svalbard and Jan Mayen | Apostolic Vicariate of Northern Norway was promoted as Territorial Prelature of Tromsø (without ecclesiastical province) |
| 1979.03.28 | Norway | Apostolic Vicariate of Central Norway was promoted as Territorial Prelature of Trondheim (without ecclesiastical province) |
| 1979.04.04 | Italy | Diocese of Cariati lost territory to Diocese of Crotone |
| 1979.04.04 | Italy | Diocese of Cassano all’Jonio lost territory to Diocese of San Marco Argentano–Scalea |
| 1979.04.04 | Italy | Diocese of Crotone lost territory to Archdiocese of Santa Severina |
| 1979.04.04 | Italy | Diocese of San Marco was renamed as Diocese of San Marco Argentano–Scalea (gained territory from Diocese of Cassano all’Jonio and lost territory to Archdiocese of Cosenza) |
| 1979.04.18 |  Brazil | Territorial Prelature of Rubiataba was renamed as Territorial Prelature of Rubiataba–Mozarlândia |
| 1979.04.28 | Brazil | Diocese of Irecê was established (from Diocese of Barra and Diocese of Ruy Barbosa and became suffragan of São Salvador da Bahia) |
| 1979.04.30 | Italy | Metropolitan Archdiocese of Capua was demoted as Archdiocese of Capua (became suffragan of Napoli) |
| 1979.04.30 | Italy | Metropolitan Archdiocese of Conza was demoted as Archdiocese of Conza (became suffragan of Benevento) |
| 1979.04.30 | Italy | Diocese of Foggia was promoted as Metropolitan Archdiocese of Foggia (with suffragan sees Manfredonia, Ascoli Satriano, Cerignola, Lucera, San Severo, Troia and Vieste) |
| 1979.04.30 | Italy | Metropolitan Archdiocese of Manfredonia was demoted as Archdiocese of Manfredonia (became suffragan of Foggia) |
| 1979.04.30 | Italy | Metropolitan Archdiocese of Sorrento was demoted as Archdiocese of Sorrento (became suffragan of Napoli) |
| 1979.05.03 |  Micronesia,  Palau | Apostolic Vicariate of Caroline and Marshall Islands was promoted as Diocese of Carolines–Marshalls (became suffragan of Suva) |
| 1979.05.16 |  Angola | Diocese of Silva Porto was renamed as Diocese of Kwito-Bié |
| 1979.05.16 | Angola | Diocese of Luso was renamed as Diocese of Luena |
| 1979.05.16 | Angola | Diocese of Serpa Pinto was renamed as Diocese of Menongue |
| 1979.05.16 | Angola | Diocese of Pereira de Eça was renamed as Diocese of Ondjiva |
| 1979.05.16 | Angola | Diocese of Henrique de Carvalho was renamed as Diocese of Saurimo |
| 1979.05.16 | Angola | Diocese of Carmona e São Salvador was renamed as Diocese of Uíje |
| 1979.05.21 | Brazil | Diocese of Barreiras was established (from Diocese of Barra and became suffragan of São Salvador da Bahia) |
| 1979.06.01 | Brazil | Diocese of Itabira was renamed as Diocese of Itabira–Fabriciano |
| 1979.06.01 |  Pakistan | Diocese of Rawalpindi was renamed as Diocese of Islamabad–Rawalpindi |
| 1979.06.10 | Italy | Diocese of Mileto lost territory to Metropolitan Archdiocese of Reggio Calabria and Diocese of Oppido Mamertina–Palmi |
| 1979.06.10 | Italy | Diocese of Oppido Mamertina was renamed as Diocese of Oppido Mamertina–Palmi (gained territory from Diocese of Mileto) |
| 1979.07.03 |  Argentina | Diocese of Santo Tomé was established (from Metropolitan Archdiocese of Corrientes and Diocese of Goya and became suffragan of Corrientes) |
| 1979.07.04 |  India | Diocese of Rourkela was established (from Diocese of Sambalpur and became suffragan of Cuttack–Bhubaneswar) |
| 1979.08.20 |  Venezuela | Diocese of Ciudad Guayana was established (from Metropolitan Archdiocese of Ciudad Bolívar and became suffragan of Ciudad Bolívar) |
| 1979.08.29 |  Honduras | Territorial Prelature of Choluteca was promoted as Diocese of Choluteca |
| 1979.10.15 | Italy | Diocese of Avellino exchanged territory with Territorial Abbacy of Montevergine |
| 1979.10.15 | Italy | Diocese of Cava de’ Tirreni lost territory to Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni |
| 1979.10.15 | Italy | Territorial Abbacy of Montevergine exchanged territory with Diocese of Avellino |
| 1979.10.15 | Italy | Diocese of Nocera de’ Pagani exchanged territory with Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni |
| 1979.10.15 | Italy | Metropolitan Archdiocese of Salerno lost territory to Diocese of Nocera de’ Pagani |
| 1979.10.15 | Italy | Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni lost territory to Diocese of Diano–Teggiano and Diocese of Vallo di Lucania |
| 1979.10.16 | Brazil | Territorial Prelature of Carolina was promoted as Diocese of Carolina |
| 1979.10.16 | Brazil | Diocese of Cascavel was promoted as Metropolitan Archdiocese of Cascavel (with suffragan sees Foz do Iguaçu, Palmas and Toledo) |
| 1979.10.16 | Brazil | Territorial Prelature of Diamantino was promoted as Diocese of Diamantino |
| 1979.10.16 | Brazil | Territorial Prelature of Formosa was promoted as Diocese of Formosa |
| 1979.10.16 | Brazil | Territorial Prelature of Guajará-Mirim was promoted as Diocese of Guajará-Mirim |
| 1979.10.16 | Brazil | Territorial Prelature of Guamá was promoted as Diocese of Guamá |
| 1979.10.16 | Brazil | Territorial Prelature of Humaitá was promoted as Diocese of Humaitá |
| 1979.10.16 | Brazil | Territorial Prelature of Marabá was promoted as Diocese of Marabá |
| 1979.10.16 | Brazil | Diocese of Maringá was promoted as Metropolitan Archdiocese of Maringá (with suffragan sees Campo Mourão, Paranavaí and Umuarama) |
| 1979.10.16 | Brazil | Territorial Prelature of Pinheiro was promoted as Diocese of Pinheiro |
| 1979.10.16 | Brazil | Territorial Prelature of Ponta de Pedras was promoted as Diocese of Ponta de Pedras |
| 1979.10.16 | Brazil | Territorial Prelature of Porto Velho was promoted as Diocese of Porto Velho |
| 1979.10.16 | Brazil | Territorial Prelature of Roraima was promoted as Diocese of Roraima |
| 1979.10.16 | Brazil | Territorial Prelature of Rubiataba–Mozarlândia was promoted as Diocese of Rubiataba–Mozarlândia |
| 1979.10.16 | Brazil | Territorial Prelature of Santarém was promoted as Diocese of Santarém |
| 1979.10.16 | Brazil | Territorial Prelature of Santíssima Conceição do Araguaia was promoted as Diocese of Santíssima Conceição do Araguaia |
| 1979.11.03 |  France | Diocese of Belfort–Montbéliard was established (from Metropolitan Archdiocese of Besançon and became suffragan of Besançon) |
| 1979.11.05 |  Philippines | Diocese of Cotabato was promoted as Metropolitan Archdiocese of Cotabato (with suffragan sees Kidapawan and Marbel) |
| 1979.11.05 | Philippines | Diocese of Digos was established (from Metropolitan Archdiocese of Davao and became suffragan of Davao) |
| 1979.11.15 |  Germany | Diocese of Meißen was renamed as Diocese of Dresden–Meißen |
| 1979.12.24 | Philippines | Territorial Prelature of Ipil was established (from Metropolitan Archdiocese of Zamboanga and became suffragan of Zamboanga) |
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