 | 2016 | 2017 | 2018 |  |
Date | Country | Change |
| 2017.01.02 |  Honduras | Diocese of Danlí was established (from Metropolitan Archdiocese of Tegucigalpa and became suffragan of Tegucigalpa) |
| 2017.02.02 |  Bangladesh | Diocese of Chittagong was promoted as Metropolitan Archdiocese of Chittagong (with suffragan sees Barisal and Khulna) |
| 2017.02.08 |  Madagascar | Diocese of Maintirano was established (from Diocese of Mahajanga, Diocese of Morondava and Diocese of Tsiroanomandidy and became suffragan of Antananarivo) |
| 2017.03.02 |  France | Diocese of Nantes lost territory to Diocese of Angers |
| 2017.03.18 |  Canada | Diocese of Sault Sainte Marie lost territory to Diocese of Thunder Bay |
| 2017.04.01 |  Equatorial Guinea | Diocese of Evinayong was established (from Diocese of Bata and became suffragan of Malabo) |
| 2017.04.01 | Equatorial Guinea | Diocese of Mongomo was established (from Diocese of Ebebiyín and became suffragan of Malabo) |
| 2017.07.15 |  Italy | Diocese of Arezzo–Cortona–Sansepolcro lost territory to Metropolitan Archdiocese of Perugia–Città della Pieve |
| 2017.08.05 |  India | Diocese of Parassala (Syro-Malankara Rite) was established (from Metropolitan Archdiocese of Trivandrum and became suffragan of Trivandrum) |
| 2017.09.12 |  Ukraine | Diocese of Chernivtsi (Ukrainian Rite) was established (from Diocese of Kolomyia–Chernivtsi and became suffragan of Ivano-Frankivsk) |
| 2017.09.12 | Ukraine | Diocese of Kolomyia–Chernivtsi (Ukrainian Rite) was renamed as Diocese of Kolomyia (lost territory to establish Diocese of Chernivtsi) |
| 2017.09.21 |  Nigeria | Apostolic Vicariate of Bomadi was promoted as Diocese of Bomadi (became suffragan of Benin City) |
| 2017.10.02 |  Botswana | Apostolic Vicariate of Francistown was promoted as Diocese of Francistown |
| 2017.10.09 | India | Metropolitan Archdiocese of Changanacherry (Syro-Malabar Rite) lost territory to Diocese of Thuckalay |
| 2017.10.10 | India | Diocese of Hosur (Syro-Malabar Rite) was established (without ecclesiastical province) |
| 2017.10.10 | India | Diocese of Shamshabad (Syro-Malabar Rite) was established (without ecclesiastical province) |
| 2017.11.01 |  Chile | Diocese of Chillán was renamed as Diocese of San Bartolomé de Chillán |
| 2017.11.22 |  Brazil | Diocese of Cruz das Almas was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 2017.11.30 |  Nicaragua | Apostolic Vicariate of Bluefields was promoted as Diocese of Bluefields (lost territory to establish Diocese of Siuna) |
| 2017.11.30 | Nicaragua | Diocese of Siuna was established (from Apostolic Vicariate of Bluefields and became suffragan of Managua) |
| 2017.12 | Italy | Titular Episcopal See of Amantea was restored |
| 2017.12 | Italy | Titular Episcopal See of Limosano was restored |
| 2017.12 | Italy | Titular Episcopal See of Malamocco was restored |
| 2017.12 |  Netherlands | Titular Episcopal See of Middelburg was restored |
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