Date | Country | Change |
| 1976 |  Italy | Titular Episcopal See of Castro was renamed as Titular Episcopal See of Castro di Puglia |
| 1976 | Italy | Titular Episcopal See of Castro was renamed as Titular Episcopal See of Castro di Sardegna |
| 1976.01.01 |  India | Metropolitan Archdiocese of Goa and Daman was demoted as Archdiocese of Goa and Daman (without ecclesiastical province) |
| 1976.01.17 |  Philippines | Diocese of Capiz was promoted as Metropolitan Archdiocese of Capiz (with suffragan sees Kalibo and Romblon and lost territory to establish Diocese of Kalibo) |
| 1976.01.17 | Philippines | Diocese of Kalibo was established (from Diocese of Capiz and became suffragan of Capiz) |
| 1976.01.24 | India | Diocese of Karwar was established (from Diocese of Belgaum and became suffragan of Bangalore) |
| 1976.03.01 |  Mexico | Apostolic Prefecture of La Paz was promoted as Apostolic Vicariate of La Paz |
| 1976.03.01 |  Puerto Rico | Diocese of Mayagüez was established (from Diocese of Arecibo and Diocese of Ponce and became suffragan of San Juan de Puerto Rico) |
| 1976.03.06 |  Paraguay | Territorial Prelature of Coronel Oviedo was promoted as Diocese of Coronel Oviedo |
| 1976.03.13 |  England | Diocese of East Anglia was restored (from Diocese of Northampton and became suffragan of Westminster) |
| 1976.03.24 |  USA | Diocese of Orange was established (from Metropolitan Archdiocese of Los Angeles and became suffragan of Los Angeles) |
| 1976.03.27 |  Argentina | Diocese of Zárate–Campana was established (from Diocese of San Isidro and Diocese of San Nicolás de los Arroyos and became suffragan of La Plata) |
| 1976.03.27 |  Brazil | Territorial Prelature of Santíssima Conceição do Araguaia was restored (from Territorial Prelature of Cristalândia and Territorial Prelature of Marabá and became suffragan of Belém do Pará) |
| 1976.04.10 |  Rwanda | Metropolitan Archdiocese of Kabgayi was demoted as Diocese of Kabgayi (lost territory to establish Metropolitan Archdiocese of Kigali and became suffragan of Kigali) |
| 1976.04.10 | Rwanda | Metropolitan Archdiocese of Kigali was established (from Metropolitan Archdiocese of Kabgayi and with suffragan sees Butare, Kabgayi, Kibungo, Nyundo and Ruhengeri) |
| 1976.04.24 |  Dominican Republic | Diocese of Barahona was established (from Diocese of San Juan de la Maguana and became suffragan of Santo Domingo) |
| 1976.04.29 | Brazil | Diocese of Limeira was established (from Metropolitan Archdiocese of Campinas and Diocese of Piracicaba and became suffragan of Campinas) |
| 1976.05.02 |  Western Sahara | Apostolic Prefecture of Sahara Español was renamed as Apostolic Prefecture of Western Sahara |
| 1976.05.18 |  Ecuador | Apostolic Vicariate of Canelos was renamed as Apostolic Vicariate of Puyo |
| 1976.05.31 | India | Diocese of Nalgonda was established (from Metropolitan Archdiocese of Hyderabad and Diocese of Warangal and became suffragan of Hyderabad) |
| 1976.05.31 |  Malaysia | Apostolic Vicariate of Kota Kinabalu was promoted as Diocese of Kota Kinabalu (became suffragan of Kuching) |
| 1976.05.31 | Malaysia | Apostolic Vicariate of Kuching was promoted as Metropolitan Archdiocese of Kuching (with suffragan sees Kota Kinabalu and Miri) |
| 1976.05.31 | Malaysia | Apostolic Vicariate of Miri was promoted as Diocese of Miri (became suffragan of Kuching) |
| 1976.06.12 | Philippines | Territorial Prelature of Cotabato was promoted as Diocese of Cotabato (lost territory to establish Territorial Prelature of Kidapawan) |
| 1976.06.12 | Philippines | Territorial Prelature of Kidapawan was established (from Territorial Prelature of Cotabato and became suffragan of Davao) |
| 1976.06.19 | Argentina | Diocese of Quilmes was established (from Metropolitan Archdiocese of La Plata and Diocese of Avellaneda and became suffragan of La Plata) |
| 1976.06.21 | Italy | Metropolitan Archdiocese of L’Aquila exchanged territory with Diocese of Rieti |
| 1976.06.21 | Italy | Diocese of Narni lost territory to Diocese of Rieti |
| 1976.06.21 | Italy | Diocese of Norcia lost territory to Diocese of Rieti |
| 1976.06.21 | Italy | Diocese of Rieti exchanged territory with Metropolitan Archdiocese of L’Aquila |
| 1976.06.21 | Italy | Archdiocese of Spoleto lost territory to Diocese of Rieti |
| 1976.06.28 | USA | Apostolic Exarchate of United States of America (Greek-Melkite Rite) was promoted as Diocese of Newton (without ecclesiastical province) |
| 1976.07.29 |  Mozambique | Diocese of Vila Cabral was renamed as Diocese of Lichinga |
| 1976.08.21 | Italy | Metropolitan Archdiocese of Acerenza was demoted as Diocese of Acerenza (became suffragan of Potenza) |
| 1976.08.21 | Italy | Diocese of Andria lost territory to Diocese of Venosa |
| 1976.08.21 | Italy | Archdiocese of Boiano–Campobasso was promoted as Metropolitan Archdiocese of Boiano–Campobasso (with suffragan sees Isernia, Termoli, Trivento and Venafro) |
| 1976.08.21 | Italy | Metropolitan Archdiocese of Matera was demoted as Diocese of Matera (lost territory to Diocese of Castellaneta and became suffragan of Potenza) |
| 1976.08.21 | Italy | Archdiocese of Potenza was promoted as Metropolitan Archdiocese of Potenza (with suffragan sees Acerenza, Anglona–Tursi, Marsico Nuovo, Matera, Melfi, Muro Lucano, Rapolla, Tricarico and Venosa) |
| 1976.08.21 | Italy | Diocese of Venosa lost territory to Diocese of Gravina |
| 1976.09.08 | Italy | Diocese of Acerenza lost territory to Metropolitan Archdiocese of Potenza |
| 1976.09.08 | Italy | Diocese of Anglona–Tursi was suppressed (to Diocese of Cassano all’Jonio and to establish Diocese of Tursi–Lagonegro) |
| 1976.09.08 | Italy | Metropolitan Archdiocese of Conza lost territory to Diocese of Melfi |
| 1976.09.08 | Italy | Diocese of Matera lost territory to Diocese of Castellaneta |
| 1976.09.08 | Italy | Diocese of Muro Lucano lost territory to Diocese of Melfi |
| 1976.09.08 | Italy | Diocese of Rapolla lost territory to Metropolitan Archdiocese of Potenza |
| 1976.09.08 | Italy | Territorial Abbacy of Santissima Trinità di Cava de’ Tirreni lost territory to Metropolitan Archdiocese of Potenza |
| 1976.09.08 | Italy | Diocese of Tricarico lost territory to Diocese of Matera |
| 1976.09.08 | Italy | Diocese of Tursi–Lagonegro was restored (from Metropolitan Archdiocese of Potenza, Diocese of Cassano all’Jonio, Diocese of Diano–Teggiano, Diocese of Matera and Diocese of Policastro, from the suppressed Diocese of Anglona–Tursi and became suffragan of Potenza) |
| 1976.09.17 |  Canada | Diocese of Alexandria in Ontario was renamed as Diocese of Alexandria–Cornwall |
| 1976.09.17 | Mozambique | Diocese of Porto Amélia was renamed as Diocese of Pemba |
| 1976.09.18 | Mozambique | Metropolitan Archdiocese of Lourenço Marques was renamed as Metropolitan Archdiocese of Maputo |
| 1976.10.01 | Mozambique | Diocese of João Belo was renamed as Diocese of Xai-Xai |
| 1976.10.13 | USA | Diocese of Reno was renamed as Diocese of Reno–Las Vegas |
| 1976.10.18 | USA | Diocese of Alexandria was renamed as Diocese of Alexandria–Shreveport |
| 1976.10.19 | India | Diocese of Cuddapah was established (from Diocese of Nellore and became suffragan of Hyderabad) |
| 1976.10.28 |  New Zealand | Military Vicariate of New Zealand was established |
| 1976.11.13 |  Congo-Kinshasa | Metropolitan Archdiocese of Lubumbashi lost territory to Diocese of Sakania |
| 1976.11.20 | Philippines | Territorial Prelature of Marawi was established (from Territorial Prelature of Iligan and became suffragan of Cagayan de Oro) |
| 1976.11.23 |  Vietnam | Metropolitan Archdiocese of Saigon was renamed as Metropolitan Archdiocese of Thành-Phô Hô Chí Minh |
| 1976.12.03 | Brazil | Diocese of União da Vitória was established (from Metropolitan Archdiocese of Curitiba, Diocese of Guarapuava and Diocese of Ponta Grossa and became suffragan of Curitiba) |
| 1976.12.08 | Italy | Metropolitan Archdiocese of Ferrara was demoted as Archdiocese of Ferrara (became suffragan of Bologna) |
| 1976.12.09 | India | Diocese of Eluru was established (from Diocese of Vijayawada and became suffragan of Hyderabad) |
| 1976.12.09 |  Kenya | Apostolic Prefecture of Garissa was established (from Diocese of Meru and Diocese of Mombasa) |
| 1976.12.09 | Kenya | Apostolic Prefecture of Ngong was promoted as Diocese of Ngong (became suffragan of Nairobi) |
| 1976.12.09 |  Zambia | Apostolic Prefecture of Solwezi was promoted as Diocese of Solwezi (lost territory to Metropolitan Archdiocese of Lusaka and became suffragan of Lusaka) |
