 | 1969 | 1970 | 1971 |  |
Date | Country | Change |
| 1970 |  Croatia | Titular Episcopal See of Cissa was established |
| 1970 |  Czechia | Titular Episcopal See of Litomyšl was restored |
| 1970 |  Iran | Titular Metropolitan See of Rew-Ardashir (Chaldean Rite) was established |
| 1970 |  Ireland | Titular Episcopal See of Domnach Sechlainn was renamed as Titular Episcopal See of Domnach Sechnaill |
| 1970 |  Italy | Titular Episcopal See of Blera was restored |
| 1970 | Italy | Titular Episcopal See of Bolsena was restored |
| 1970 | Italy | Titular Episcopal See of Buxentum was established |
| 1970 | Italy | Titular Episcopal See of Caudium was restored |
| 1970 | Italy | Titular Episcopal See of Civitanova was established |
| 1970 | Italy | Titular Episcopal See of Cuma was restored |
| 1970 | Italy | Titular Episcopal See of Ferento was restored |
| 1970 | Italy | Titular Episcopal See of Frigento was restored |
| 1970 | Italy | Titular Episcopal See of Galazia in Campania was restored |
| 1970 | Italy | Titular Episcopal See of Grumentum was restored |
| 1970 | Italy | Titular Episcopal See of Lorium was restored |
| 1970 | Italy | Titular Episcopal See of Miseno was restored |
| 1970 | Italy | Titular Episcopal See of Ofena was restored |
| 1970 | Italy | Titular Episcopal See of Tharros was restored |
| 1970 | Italy | Titular Episcopal See of Tre Taverne was restored |
| 1970 | Italy | Titular Episcopal See of Trevi nel Lazio was established |
| 1970 |  Spain | Titular Metropolitan See of Emerita Augusta was demoted as Titular Episcopal See of Emerita Augusta |
| 1970 |  Syria | Titular Episcopal See of Apamea in Syria (Maronite Rite) was established |
| 1970 |  Turkiye | Titular Metropolitan See of Amida was suppressed |
| 1970 | Turkiye | Titular Archiepiscopal See of Nisibis (Chaldean Rite) was restored |
| 1970 | Titular Episcopal See of Dibon was suppressed | |
| 1970.01.19 |  Philippines | Diocese of San Fernando de La Union was established (from Metropolitan Archdiocese of Nueva Segovia and became suffragan of Lingayen–Dagupan) |
| 1970.01.22 |  India | Metropolitan Archdiocese of Gauhati–Shillong was renamed as Metropolitan Archdiocese of Shillong–Gauhati |
| 1970.01.31 | Philippines | Diocese of Ilagan was established (from Diocese of Tuguegarao and Territorial Prelature of Infanta and became suffragan of Nueva Segovia) |
| 1970.02.05 |  Cameroon | Diocese of Bafoussam was established (from Diocese of Nkongsamba and became suffragan of Yaoundé) |
| 1970.02.26 |  Canada | Diocese of Fort William was renamed as Diocese of Thunder Bay |
| 1970.03.07 |  Barbados | Diocese of Bridgetown–Kingstown was established (from Diocese of Saint George’s in Grenada and became suffragan of Port of Spain) |
| 1970.03.10 |  Peru | Metropolitan Archdiocese of Lima lost territory to Diocese of Callao |
| 1970.03.23 |  Congo-Kinshasa | Diocese of Niangara was renamed as Diocese of Isiro–Niangara |
| 1970.04.07 |  Botswana | Diocese of Gaberones was renamed as Diocese of Gaborone |
| 1970.04.15 |  Venezuela | Diocese of La Guaira was established (from Metropolitan Archdiocese of Caracas and became suffragan of Caracas) |
| 1970.04.30 |  Chile | Diocese of Talca lost territory to Diocese of Rancagua |
| 1970.05.02 |  Western Sahara | Apostolic Prefecture of Sahara Español e Ifni was renamed as Apostolic Prefecture of Sahara Español |
| 1970.05.23 |  Mexico | Territorial Prelature of Chetumal was established (from Metropolitan Archdiocese of Yucatán and Diocese of Campeche and became suffragan of Yucatán) |
| 1970.06.02 | Chile | Apostolic Vicariate of Aysén lost territory to Diocese of San Carlos de Ancud |
| 1970.06.05 | India | Apostolic Prefecture of Benares-Gorakhpur was promoted as Diocese of Banaras |
| 1970.06.06 |  Angola | Diocese of Benguela was established (from Diocese of Nova Lisboa and became suffragan of Luanda) |
| 1970.06.18 | Chile | Diocese of Rancagua lost territory to Metropolitan Archdiocese of Santiago |
| 1970.06.19 |  Mozambique | Diocese of João Belo was established (from Metropolitan Archdiocese of Lourenço Marques and became suffragan of Lourenço Marques) |
| 1970.06.20 |  Thailand | Diocese of Chiang Mai lost territory to Diocese of Nakhon Sawan |
| 1970.06.20 |  USA | Diocese of Memphis was established (from Diocese of Nashville and became suffragan of Louisville) |
| 1970.06.29 | Philippines | Diocese of Davao was promoted as Metropolitan Archdiocese of Davao (with suffragan sees Cotabato, Marbel and Tagum) |
| 1970.07.03 | Congo-Kinshasa | Diocese of Doruma was renamed as Diocese of Doruma–Dungu |
| 1970.08.13 | Cameroon | Diocese of Bamenda was established (from Diocese of Buéa and became suffragan of Yaoundé) |
| 1970.08.13 |  Senegal | Apostolic Prefecture of Tambacounda was established (from Diocese of Kaolack and Diocese of Saint-Louis du Sénégal) |
| 1970.09.08 |  Jamaica | Metropolitan Archdiocese of Kingston in Jamaica lost territory to Diocese of Nassau |
| 1970.10.08 | India | Diocese of Patna lost territory to Diocese of Bhagalpur |
| 1970.10.08 | India | Metropolitan Archdiocese of Ranchi lost territory to Diocese of Bhagalpur |
| 1970.10.31 |  Brazil | Diocese of Londrina was promoted as Metropolitan Archdiocese of Londrina (with suffragan sees Apucarana, Campo Mourão, Jacarezinho, Maringá and Paranavaí) |
| 1970.11.11 |  Colombia | Apostolic Prefecture of Arauca was promoted as Apostolic Vicariate of Arauca |
| 1970.11.11 |  Sierra Leone | Diocese of Freetown and Bo was promoted as Metropolitan Archdiocese of Freetown and Bo (with suffragan sees Kenema and Makeni and lost territory to establish Diocese of Kenema) |
| 1970.11.11 | Sierra Leone | Diocese of Kenema was established (from Diocese of Freetown and Bo and became suffragan of Freetown and Bo) |
| 1970.11.16 |  Saint Pierre and Miquelon | Apostolic Prefecture of Îles Saint-Pierre et Miquelon was promoted as Apostolic Vicariate of Îles Saint-Pierre et Miquelon |
| 1970.11.23 | Brazil | Metropolitan Archdiocese of Porto Alegre lost territory to Diocese of Caxias do Sul |
| 1970.12.19 | USA | Diocese of Gaylord was established (from Diocese of Grand Rapids and Diocese of Saginaw and became suffragan of Detroit) |
| 1970.12.19 | USA | Diocese of Kalamazoo was established (from Diocese of Grand Rapids and Diocese of Lansing and became suffragan of Detroit) |
| 1970.12.26 |  France | Diocese of Saint-Étienne was established (from Metropolitan Archdiocese of Lyon and became suffragan of Lyon) |
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