 | 1972 | 1973 | 1974 |  |
Date | Country | Change |
| 1973 |  Italy | Diocese of Città della Pieve lost territory to Diocese of Acquapendente and Diocese of Chiusi |
| 1973 | Italy | Diocese of Civita Castellana lost territory to Diocese of Bagnoregio |
| 1973 |  Scotland | Titular Episcopal See of Abercorn was established |
| 1973 | Scotland | Titular Episcopal See of Abernethy was restored |
| 1973 | Scotland | Titular Episcopal See of Mortlach was restored |
| 1973 | Scotland | Titular Episcopal See of Rosemarkie was restored |
| 1973 | Scotland | Titular Episcopal See of Strathearn was restored |
| 1973 |  Syria | Titular Episcopal See of Epiphania in Syria was renamed as Titular Episcopal See of Epiphania in Syria |
| 1973 |  Tunisia | Titular Episcopal See of Matara in Proconsulari was renamed as Titular Episcopal See of Matara in Proconsulari |
| 1973 |  Turkiye | Titular Episcopal See of Corydala was renamed as Titular Episcopal See of Corydala |
| 1973 | Turkiye | Titular Episcopal See of Daonium was renamed as Titular Episcopal See of Daonium |
| 1973 |  Ukraine | Titular Episcopal See of Lutsk–Ostroh (Ukrainian Rite) was suppressed |
| 1973 | Titular Episcopal See of Possala was suppressed | |
| 1973.01.05 | Italy | Diocese of Anglona–Tursi exchanged territory with Diocese of Cassano all’Jonio |
| 1973.01.05 | Italy | Diocese of Cassano all’Jonio exchanged territory with Diocese of Anglona–Tursi |
| 1973.01.29 |  Cameroon | Apostolic Prefecture of Maroua–Mokolo was promoted as Diocese of Maroua–Mokolo (became suffragan of Yaoundé) |
| 1973.01.29 | Cameroon | Apostolic Prefecture of Yagoua was promoted as Diocese of Yagoua (became suffragan of Yaoundé) |
| 1973.01.29 |  India | Diocese of Kohima–Imphal was established (from Diocese of Dibrugarh and became suffragan of Shillong–Gauhati) |
| 1973.02.11 | Italy | Diocese of Boiano–Campobasso was promoted as Archdiocese of Boiano–Campobasso (without ecclesiastical province) |
| 1973.02.11 | Italy | Diocese of Potenza was promoted as Archdiocese of Potenza (without ecclesiastical province) |
| 1973.03.01 |  Ghana | Diocese of Sunyani was established (from Diocese of Kumasi and became suffragan of Cape Coast) |
| 1973.03.01 | India | Diocese of Mananthavady (Syro-Malabar Rite) was established (from Diocese of Tellicherry and became suffragan of Ernakulam) |
| 1973.03.01 | India | Diocese of Tura was established (from Metropolitan Archdiocese of Shillong–Gauhati and became suffragan of Shillong–Gauhati) |
| 1973.03.01 |  Nigeria | Diocese of Abakaliki was established (from Diocese of Ogoja and became suffragan of Onitsha) |
| 1973.03.24 | Italy | Diocese of Bagnoregio lost territory to Diocese of Orvieto |
| 1973.03.24 | Italy | Diocese of Orvieto lost territory to Diocese of Acquapendente |
| 1973.03.31 | Italy | Diocese of Campagna lost territory to Archdiocese of Potenza |
| 1973.03.31 | Italy | Diocese of Muro Lucano lost territory to Diocese of Campagna |
| 1973.04.03 | India | Diocese of Ajmer–Jaipur lost territory to Apostolic Exarchate of Sagar |
| 1973.04.13 |  Burundi | Diocese of Ruyigi was established (from Metropolitan Archdiocese of Gitega and Diocese of Bururi and became suffragan of Gitega) |
| 1973.04.14 |  Brazil | Diocese of Barretos was established (from Metropolitan Archdiocese of Ribeirão Preto and Diocese of Jaboticabal and became suffragan of Ribeirão Preto) |
| 1973.05.17 | India | Diocese of Palayamkottai was established (from Metropolitan Archdiocese of Madurai and became suffragan of Madurai) |
| 1973.05.26 | Brazil | Diocese of Cornélio Procópio was established (from Diocese of Jacarezinho and became suffragan of Londrina) |
| 1973.05.26 | Brazil | Diocese of Umuarama was established (from Diocese of Campo Mourão and became suffragan of Londrina) |
| 1973.06.25 |  Australia | Diocese of Saint Maron of Sydney (Maronite Rite) was established (without ecclesiastical province) |
| 1973.07.05 | India | Apostolic Prefecture of Raipur was promoted as Diocese of Raipur |
| 1973.07.05 | Nigeria | Diocese of Issele-Uku was established (from Diocese of Benin City and became suffragan of Lagos) |
| 1973.07.23 |  Germany | Apostolic Administration of Erfurt–Meiningen was restored (from Diocese of Fulda and Diocese of Würzburg) |
| 1973.07.23 | Germany | Apostolic Administration of Magdeburg was restored (from Metropolitan Archdiocese of Paderborn) |
| 1973.07.23 | Germany | Apostolic Administration of Schwerin was restored (from Diocese of Osnabrück) |
| 1973.08.22 |  Indonesia | Diocese of Bandjarmasin was renamed as Diocese of Banjarmasin |
| 1973.08.22 | Indonesia | Metropolitan Archdiocese of Djakarta was renamed as Metropolitan Archdiocese of Jakarta |
| 1973.08.22 | Indonesia | Diocese of Djajapura was renamed as Diocese of Jayapura |
| 1973.08.22 | Indonesia | Diocese of Surabaia was renamed as Diocese of Surabaya |
| 1973.08.22 | Indonesia | Diocese of Tandjung-Karang was renamed as Diocese of Tanjungkarang |
| 1973.08.22 | Indonesia | Metropolitan Archdiocese of Makassar was renamed as Metropolitan Archdiocese of Ujung Pandang |
| 1973.09.17 |  Malawi | Apostolic Prefecture of Fort Johnston was promoted as Diocese of Mangochi (became suffragan of Blantyre) |
| 1973.09.17 | Nigeria | Apostolic Prefecture of Minna was promoted as Diocese of Minna (became suffragan of Kaduna) |
| 1973.10.13 |  Mexico | Diocese of Celaya was established (from Metropolitan Archdiocese of Morelia and Diocese of León and became suffragan of Morelia) |
| 1973.10.15 |  Chad | Metropolitan Archdiocese of Fort-Lamy was renamed as Metropolitan Archdiocese of N’Djaména |
| 1973.11.21 | Italy | Diocese of Nicastro lost territory to Archdiocese of Cosenza |
| 1973.11.22 | Italy | Archdiocese of Cosenza lost territory to Diocese of Lungro |
| 1973.11.29 |  Canada | Diocese of Rouyn-Noranda was established (from Diocese of Timmins and became suffragan of Ottawa) |
| 1973.12.01 | Italy | Diocese of Albenga was renamed as Diocese of Albenga–Imperia |
| 1973.12.17 |  Zimbabwe | Apostolic Prefecture of Sinoia was established (from Metropolitan Archdiocese of Salisbury) |
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