 | 1988 | 1989 | 1990 |  |
Date | Country | Change |
| 1989 |  Algeria | Titular Episcopal See of Castellum Titulianum was established |
| 1989 | Algeria | Titular Episcopal See of Catrum was established |
| 1989 | Algeria | Titular Episcopal See of Enera was established |
| 1989 | Algeria | Titular Episcopal See of Murcona was established |
| 1989 | Algeria | Titular Episcopal See of Musti in Numidia was established |
| 1989 | Algeria | Titular Episcopal See of Turuda was established |
| 1989 |  Austria | Titular Episcopal See of Wiener Neustadt was restored |
| 1989 |  Bosnia and Herzegovina | Titular Episcopal See of Bistue was restored |
| 1989 |  Palestine | Titular Metropolitan See of Nazareth was suppressed (united to Archdiocese of Trani–Barletta–Bisceglie) |
| 1989 |  Tunisia | Titular Episcopal See of Ausana was established |
| 1989 | Tunisia | Titular Episcopal See of Ausuaga was established |
| 1989 | Tunisia | Titular Episcopal See of Bossa was established |
| 1989 | Tunisia | Titular Episcopal See of Buleliana was established |
| 1989 | Tunisia | Titular Episcopal See of Bulna was established |
| 1989 | Tunisia | Titular Episcopal See of Buslacena was restored |
| 1989 | Tunisia | Titular Episcopal See of Canapium was established |
| 1989 | Tunisia | Titular Episcopal See of Cebarades was established |
| 1989 | Tunisia | Titular Episcopal See of Cibaliana was established |
| 1989 | Tunisia | Titular Episcopal See of Macon was established |
| 1989 | Tunisia | Titular Episcopal See of Mattiana was established |
| 1989 | Tunisia | Titular Episcopal See of Paria in Proconsolare was established |
| 1989 | Tunisia | Titular Episcopal See of Pia was established |
| 1989 | Tunisia | Titular Episcopal See of Pocofeltus was established |
| 1989 | Tunisia | Titular Episcopal See of Taddua was established |
| 1989 | Tunisia | Titular Episcopal See of Tagarata was established |
| 1989 | Tunisia | Titular Episcopal See of Tagarbala was established |
| 1989 | Tunisia | Titular Episcopal See of Tagaria was established |
| 1989 | Tunisia | Titular Episcopal See of Tagase was established |
| 1989 | Tunisia | Titular Episcopal See of Tamazeni was established |
| 1989 | Tunisia | Titular Episcopal See of Thagamuta was established |
| 1989 | Tunisia | Titular Episcopal See of Thibaris was renamed as Titular Episcopal See of Thibaris |
| 1989 | Tunisia | Titular Episcopal See of Vertara was established |
| 1989 | Tunisia | Titular Episcopal See of Zama maior was renamed as Titular Episcopal See of Zama maior |
| 1989 | Titular Episcopal See of Sitipa was established | |
| 1989.01.19 |  Colombia | Apostolic Vicariate of San José del Guaviare was established (from Apostolic Prefecture of Mitú) |
| 1989.01.19 |  India | Diocese of Bareilly was established (from Diocese of Lucknow and became suffragan of Agra) |
| 1989.02.18 |  Argentina | Diocese of San Gregorio de Narek en Buenos Aires (Armenian Rite) was established (from Apostolic Exarchate of América Latina e México and without ecclesiastical province) |
| 1989.03.03 |  Italy | Metropolitan Archdiocese of Milano (Ambrosian Rite) lost territory to Diocese of Lodi |
| 1989.03.06 |  Chad | Diocese of Doba was established (from Diocese of Moundou and became suffragan of N’Djaména) |
| 1989.03.06 |  Uganda | Diocese of Kasese was established (from Diocese of Fort Portal and without ecclesiastical province) |
| 1989.03.15 |  Brazil | Diocese of Campo Limpo was established (from Metropolitan Archdiocese of São Paulo and became suffragan of São Paulo) |
| 1989.03.15 | Brazil | Diocese of Osasco was established (from Metropolitan Archdiocese of São Paulo and became suffragan of São Paulo) |
| 1989.03.15 | Brazil | Diocese of Santo Amaro was established (from Metropolitan Archdiocese of São Paulo and became suffragan of São Paulo) |
| 1989.03.15 | Brazil | Diocese of São Miguel Paulista was established (from Metropolitan Archdiocese of São Paulo and became suffragan of São Paulo) |
| 1989.03.29 | Brazil | Diocese of Luziânia was established (from Diocese of Anápolis, Diocese of Ipameri and Diocese of Uruaçu and became suffragan of Brasília) |
| 1989.04.17 |  Senegal | Apostolic Prefecture of Tambacounda was promoted as Diocese of Tambacounda (became suffragan of Dakar) |
| 1989.05.10 | Argentina | Diocese of Mercedes was renamed as Diocese of Mercedes–Luján |
| 1989.06.17 |  Mexico | Diocese of Tlalnepantla was promoted as Metropolitan Archdiocese of Tlalnepantla (with suffragan sees Cuautitlán, Nezahualcóyotl and Texcoco) |
| 1989.06.19 | Colombia | Apostolic Prefecture of Mitú was promoted as Apostolic Vicariate of Mitú–Puerto Inírida |
| 1989.06.19 |  Nigeria | Mission sui juris of Abuja was promoted as Diocese of Abuja (became suffragan of Kaduna) |
| 1989.07.04 | Nigeria | Diocese of Uyo was established (from Diocese of Calabar and became suffragan of Onitsha) |
| 1989.07.08 | Colombia | Diocese of Líbano–Honda was established (from Metropolitan Archdiocese of Ibagué and became suffragan of Ibagué) |
| 1989.08.21 | Brazil | Metropolitan Archdiocese of São Paulo lost territory to Diocese of Campo Limpo |
| 1989.09.16 | Italy | Metropolitan Archdiocese of Genova–Bobbio was renamed as Metropolitan Archdiocese of Genova (lost territory to Diocese of Chiavari and Diocese of Piacenza–Bobbio) |
| 1989.09.16 | Italy | Diocese of Piacenza was renamed as Diocese of Piacenza–Bobbio (gained territory from Metropolitan Archdiocese of Genova–Bobbio) |
| 1989.10.04 | Brazil | Diocese of Miracema do Norte was renamed as Diocese of Miracema do Tocantins |
| 1989.10.20 | Mexico | Diocese of Chilapa was renamed as Diocese of Chilpancingo–Chilapa |
| 1989.10.23 |  Barbados | Diocese of Bridgetown–Kingstown was renamed as Diocese of Bridgetown (lost territory to establish Diocese of Kingstown) |
| 1989.10.23 |  Cote d’Ivoire | Diocese of San Pedro was established (from Diocese of Gagnoa and became suffragan of Abidjan) |
| 1989.10.23 |  Indonesia | Diocese of Kupang was promoted as Metropolitan Archdiocese of Kupang (with suffragan sees Atambua and Weetebula) |
| 1989.10.23 |  Saint Vincent and Grenadines | Diocese of Kingstown was established (from Diocese of Bridgetown–Kingstown and became suffragan of Castries) |
| 1989.10.28 |  Madagascar | Metropolitan Archdiocese of Tananarive was renamed as Metropolitan Archdiocese of Antananarivo |
| 1989.10.28 | Madagascar | Metropolitan Archdiocese of Diégo-Suarez was renamed as Metropolitan Archdiocese of Antsiranana |
| 1989.10.28 | Madagascar | Diocese of Majunga was renamed as Diocese of Mahajanga |
| 1989.10.28 | Madagascar | Diocese of Tuléar was renamed as Diocese of Toliara |
| 1989.11.06 | Mexico | Diocese of Nuevo Laredo was established (from Metropolitan Archdiocese of Monterrey and Diocese of Matamoros and became suffragan of Monterrey) |
| 1989.11.18 | Italy | Archdiocese of Catanzaro–Squillace exchanged territory with Diocese of Locri–Gerace |
| 1989.11.18 | Italy | Archdiocese of Cosenza–Bisignano lost territory to Archdiocese of Catanzaro–Squillace |
| 1989.11.18 | Italy | Archdiocese of Crotone–Santa Severina lost territory to Archdiocese of Catanzaro–Squillace |
| 1989.11.18 | Italy | Diocese of Locri–Gerace exchanged territory with Archdiocese of Catanzaro–Squillace |
| 1989.11.23 | Madagascar | Diocese of Fort-Dauphin was renamed as Diocese of Tôlagnaro |
| 1989.12 |  USA | Diocese of Austin lost territory to Diocese of Victoria |
| 1989.12.09 |  Philippines | Territorial Prelature of Libmanan was established (from Metropolitan Archdiocese of Caceres and became suffragan of Caceres) |
| 1989.12.18 | India | Apostolic Prefecture of Balasore was promoted as Diocese of Balasore (became suffragan of Cuttack–Bhubaneswar) |
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