 | 1974 | 1975 | 1976 |  |
Date | Country | Change |
| 1975 |  Germany | Metropolitan Archdiocese of Paderborn lost territory to Diocese of Essen |
| 1975 |  Italy | Titular Episcopal See of Forum Traiani was renamed as Titular Episcopal See of Fordongianus |
| 1975 | Italy | Titular Episcopal See of Numana was restored |
| 1975 |  Scotland | Titular Episcopal See of Hoddom was renamed as Titular Episcopal See of Hoddom |
| 1975 |  Spain | Archdiocese of Barcelona lost territory to Diocese of Gerona |
| 1975 |  Turkiye | Titular Archiepiscopal See of Adana (Greek-Melkite Rite) was established |
| 1975.01.01 |  Guinea-Bissau | Apostolic Prefecture of Portuguese Guinea was renamed as Apostolic Prefecture of Guinea-Bissau |
| 1975.01.20 |  India | Diocese of Tezpur lost territory to Diocese of Darjeeling |
| 1975.01.30 |  Vietnam | Diocese of Phan Thiêt was established (from Diocese of Nha Trang and became suffragan of Saigon) |
| 1975.03.17 |  Philippines | Diocese of Balanga was established (from Diocese of San Fernando and became suffragan of San Fernando) |
| 1975.03.17 | Philippines | Diocese of San Fernando was promoted as Metropolitan Archdiocese of San Fernando (with suffragan sees Balanga, Tarlac and Iba and lost territory to establish Diocese of Balanga) |
| 1975.04.12 |  Congo-Kinshasa | Diocese of Bikoro was suppressed (to Metropolitan Archdiocese of Mbandaka–Bikoro and Diocese of Inongo) |
| 1975.04.12 | Congo-Kinshasa | Metropolitan Archdiocese of Mbandaka was renamed as Metropolitan Archdiocese of Mbandaka–Bikoro (gained territory from the suppressed Diocese of Bikoro and lost suffragan see Bikoro) |
| 1975.04.28 |  Papua New Guinea | Diocese of Sideia was renamed as Diocese of Alotau–Sideia |
| 1975.06.05 |  Comoros,  Mayotte | Apostolic Administration of Comores was established (from Diocese of Ambanja) |
| 1975.06.12 |  Brazil | Diocese of Campo Maior was established (from Metropolitan Archdiocese of Teresina and Diocese of Parnaíba and became suffragan of Teresina) |
| 1975.06.12 | Brazil | Diocese of Joaçaba was established (from Diocese of Caçador, Diocese of Chapecó and Diocese of Lages and became suffragan of Florianópolis) |
| 1975.06.20 |  Ghana | Diocese of Keta was renamed as Diocese of Keta–Ho |
| 1975.07.03 | Italy | Diocese of Ventimiglia was renamed as Diocese of Ventimiglia–San Remo |
| 1975.07.05 | Italy | Metropolitan Archdiocese of Ancona e Umana was renamed as Metropolitan Archdiocese of Ancona |
| 1975.07.16 |  Portugal | Diocese of Santarém was established (from Patriarchal See of Lisboa and became suffragan of Lisboa) |
| 1975.07.16 | Portugal | Diocese of Setúbal was established (from Patriarchal See of Lisboa, Metropolitan Archdiocese of Évora and Diocese of Beja and became suffragan of Lisboa) |
| 1975.07.30 |  Bolivia | Diocese of Cochabamba was promoted as Metropolitan Archdiocese of Cochabamba (with suffragan sees Oruro and Aiquile) |
| 1975.07.30 | Bolivia | Diocese of Santa Cruz de la Sierra was promoted as Metropolitan Archdiocese of Santa Cruz de la Sierra |
| 1975.08.04 | Italy | Diocese of Luni–Sarzana was suppressed (to Diocese of La Spezia and to establish Diocese of Sarzana) |
| 1975.08.04 | Italy | Diocese of Sarzana was established (from the suppressed Diocese of Luni–Sarzana) |
| 1975.08.10 |  Angola | Diocese of Henrique de Carvalho was established (from Diocese of Malanje and became suffragan of Luanda) |
| 1975.08.10 | Angola | Metropolitan Archdiocese of Luanda lost territory to Diocese of Malanje |
| 1975.08.10 | Angola | Diocese of Ngunza was established (from Metropolitan Archdiocese of Luanda and became suffragan of Luanda) |
| 1975.08.10 | Angola | Diocese of Pereira de Eça was restored (from Diocese of Nova Lisboa and Diocese of Sá da Bandeira and became suffragan of Luanda) |
| 1975.08.10 | Angola | Diocese of Serpa Pinto was established (from Diocese of Nova Lisboa and Diocese of Sá da Bandeira and became suffragan of Luanda) |
| 1975.10.01 |  USA | Diocese of Pensacola–Tallahassee was established (from Diocese of Saint Augustine and became suffragan of Miami) |
| 1975.10.07 | Italy | Diocese of Arezzo lost territory to Metropolitan Archdiocese of Siena |
| 1975.10.07 | Italy | Diocese of Pistoia lost territory to Diocese of Prato |
| 1975.10.07 | Italy | Diocese of Sansepolcro lost territory to Diocese of Cesena and Diocese of Forlì |
| 1975.10.07 | Italy | Diocese of Sovana–Pitigliano lost territory to Diocese of Grosseto |
| 1975.11.20 |  Myanmar | Apostolic Prefecture of Lashio was established (from Diocese of Kengtung and became suffragan of Mandalay) |
| 1975.11.20 |  Somalia | Apostolic Vicariate of Mogadishu was promoted as Diocese of Mogadishu (without ecclesiastical province) |
| 1975.12.03 |  Burkina Faso | Diocese of Nouna was suppressed (to establish Diocese of Nouna–Dédougou) |
| 1975.12.03 | Burkina Faso | Diocese of Nouna–Dédougou was established (from the suppressed Diocese of Nouna and became suffragan of Ouagadougou) |
| 1975.12.03 |  Samoa | Diocese of Apia and Tokelau was renamed as Diocese of Samoa and Tokelau |
| 1975.12.04 | India | Diocese of Tellicherry (Syro-Malabar Rite) lost territory to Diocese of Mananthavady |
| 1975.12.19 |  Sri Lanka | Apostolic Prefecture of Anuradhapura was established (from Diocese of Jaffna and Diocese of Trincomalee–Batticaloa and became suffragan of Colombo) |
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