 | 1996 | 1997 | 1998 |  |
Date | Country | Change |
| 1997 |  Egypt,  South Sudan,  Sudan | Patriarchal Exarchate of Egypt and Sudan (Greek-Melkite Rite) was demoted as Territory Dependent on the Patriarch of Egypt and Sudan |
| 1997 |  Italy | Titular Episcopal See of Bisarcio was restored |
| 1997 |  Lebanon | Patriarchal Exarchate of Lebanon (Syriac Rite) was suppressed |
| 1997 |  Palestine,  Israel | Patriarchal Exarchate of Jerusalem (Chaldean Rite) was demoted as Territory Dependent on the Patriarch of Jerusalem |
| 1997 | Palestine | Patriarchal Exarchate of Jerusalem (Greek-Melkite Rite) was demoted as Territory Dependent on the Patriarch of Jerusalem |
| 1997 | Sudan, South Sudan | Territory Dependent on the Patriarch of Sudan (Syriac Rite) was established |
| 1997.01.02 |  Burkina Faso | Diocese of Manga was established (from Metropolitan Archdiocese of Ouagadougou and Diocese of Koupéla and became suffragan of Ouagadougou) |
| 1997.01.24 |  India | Diocese of Dharmapuri was established (from Diocese of Salem and became suffragan of Pondicherry and Cuddalore) |
| 1997.01.27 |  Slovakia | Apostolic Exarchate of Košice (Slovak Rite) was established (from Diocese of Prešov) |
| 1997.02.01 |  Dominican Republic | Diocese of San Pedro de Macorís was established (from Metropolitan Archdiocese of Santo Domingo and Diocese of Nuestra Señora de la Altagracia en Higüey and became suffragan of Santo Domingo) |
| 1997.02.20 |  Brazil | Diocese of Zé Doca lost territory to Diocese of Pinheiro |
| 1997.03.06 | Italy | Diocese of Ariano Irpino–Lacedonia exchanged territory with Metropolitan Archdiocese of Benevento |
| 1997.03.06 | Italy | Metropolitan Archdiocese of Benevento exchanged territory with Diocese of Ariano Irpino–Lacedonia |
| 1997.04.25 |  Croatia | Military Ordinariate of Vojni ordinarijat u Republici Hrvatskoj was established |
| 1997.05.13 |  Argentina | Diocese of Merlo–Moreno was established (from Diocese of Morón and became suffragan of Buenos Aires) |
| 1997.05.28 |  Lithuania | Diocese of Šiauliai was established (from Metropolitan Archdiocese of Kaunas, Diocese of Panevėžys and Diocese of Telšiai and became suffragan of Kaunas) |
| 1997.05.28 |  Mexico | Diocese of Matehuala was established (from Metropolitan Archdiocese of San Luis Potosí and Diocese of Ciudad Valles and became suffragan of San Luis Potosí) |
| 1997.06.13 |  Panama | Diocese of Colón was renamed as Diocese of Colón–Kuna Yala |
| 1997.06.14 | India | Diocese of Bagdogra was established (from Diocese of Darjeeling and became suffragan of Calcutta) |
| 1997.06.14 |  Zambia | Diocese of Mongu was established (from Diocese of Livingstone and became suffragan of Lusaka) |
| 1997.06.28 |  Central African Republic | Diocese of Kaga-Bandoro was established (from Metropolitan Archdiocese of Bangui and became suffragan of Bangui) |
| 1997.07.05 | Croatia | Diocese of Požega was established (from Metropolitan Archdiocese of Zagreb and became suffragan of Zagreb) |
| 1997.07.05 | Croatia | Diocese of Varaždin was established (from Metropolitan Archdiocese of Zagreb and became suffragan of Zagreb) |
| 1997.07.12 |  Venezuela | Diocese of Punto Fijo was established (from Diocese of Coro and became suffragan of Maracaibo) |
| 1997.09.29 |  Tajikistan | Mission sui juris of Tajikistan was established (from Apostolic Administration of Kazakhstan) |
| 1997.09.29 |  Turkmenistan | Mission sui juris of Turkmenistan was established (from Apostolic Administration of Kazakhstan) |
| 1997.09.29 |  Uzbekistan | Mission sui juris of Uzbekistan was established (from Apostolic Administration of Kazakhstan) |
| 1997.10.16 |  Benin | Diocese of Parakou was promoted as Metropolitan Archdiocese of Parakou (with suffragan sees Djougou, Kandi and Natitingou) |
| 1997.10.24 |  Ghana | Diocese of Goaso was established (from Diocese of Sunyani and became suffragan of Cape Coast) |
| 1997.10.24 | India | Diocese of Asansol was established (from Metropolitan Archdiocese of Calcutta and became suffragan of Calcutta) |
| 1997.10.24 |  Nigeria | Diocese of Abeokuta was established (from Metropolitan Archdiocese of Lagos and became suffragan of Lagos) |
| 1997.11.18 | Italy | Archdiocese of Cosenza–Bisignano lost territory to Diocese of San Marco Argentano–Scalea |
| 1997.11.21 | Argentina | Diocese of Mercedes–Luján was promoted as Archdiocese of Mercedes–Luján (without ecclesiastical province) |
| 1997.11.21 |  Brunei | Apostolic Prefecture of Brunei was established (from Diocese of Miri) |
| 1997.11.21 |  Jamaica | Apostolic Vicariate of Mandeville was promoted as Diocese of Mandeville (became suffragan of Kingston in Jamaica) |
| 1997.11.28 | Brazil | Diocese of Colatina lost territory to Diocese of São Mateus |
| 1997.12.02 |  Liechtenstein | Archdiocese of Vaduz was established (from Diocese of Chur and without ecclesiastical province) |
| 1997.12.12 | Brazil | Diocese of Caxias do Sul lost territory to Diocese of Passo Fundo and Diocese of Santa Cruz do Sul |
| 1997.12.12 | Brazil | Diocese of Cruz Alta lost territory to Diocese of Passo Fundo |
| 1997.12.12 | Brazil | Diocese of Santa Maria lost territory to Diocese of Bagé |
| 1997.12.22 |  Kyrgyzstan | Mission sui juris of Kyrgyzstan was established (from Apostolic Administration of Kazakhstan) |
| 1997.12.23 | Brazil | Diocese of Amparo was established (from Metropolitan Archdiocese of Campinas and Diocese of Limeira and became suffragan of Campinas) |
| 1997.12.23 | Brazil | Diocese of Juína was established (from Diocese of Diamantino and Diocese of Ji-Paraná and became suffragan of Cuiabá) |
| 1997.12.23 | Brazil | Territorial Prelature of Paranatinga was established (from Diocese of Barra do Garças, Diocese of Rondonópolis and Diocese of Sinop and became suffragan of Cuiabá) |
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