 | 1989 | 1990 | 1991 |  |
Date | Country | Change |
| 1990 |  Algeria | Titular Episcopal See of Cova was established |
| 1990 |  Italy | Diocese of Fano–Fossombrone–Cagli–Pergola lost territory to Metropolitan Archdiocese of Urbino–Urbania–Sant’Angelo in Vado |
| 1990 | Italy | Titular Episcopal See of Foro Flaminii was renamed as Titular Episcopal See of Foro Flaminio |
| 1990 |  Romania | Titular Archiepiscopal See of Tomi was renamed as Titular Archiepiscopal See of Constantia in Scythia |
| 1990 | Titular Episcopal See of Choba was suppressed | |
| 1990.01.13 |  Paraguay | Diocese of Villarrica was renamed as Diocese of Villarrica |
| 1990.01.31 |  Madagascar | Diocese of Tamatave was renamed as Diocese of Toamasina |
| 1990.02.19 |  Venezuela | Apostolic Exarchate of Venezuela (Greek-Melkite Rite) was established |
| 1990.03.26 |  Angola | Diocese of Ndalatando was established (from Metropolitan Archdiocese of Luanda and became suffragan of Luanda) |
| 1990.04.02 |  Nigeria | Diocese of Aba was established (from Diocese of Umuahia and became suffragan of Onitsha) |
| 1990.04.19 | Paraguay | Territorial Prelature of Encarnación was promoted as Diocese of Encarnación |
| 1990.04.23 |  Brazil | Diocese of Colatina was established (from Metropolitan Archdiocese of Vitória and became suffragan of Vitória) |
| 1990.04.30 |  Colombia | Apostolic Vicariate of Istmina was promoted as Diocese of Istmina–Tadó (became suffragan of Santa Fe de Antioquia) |
| 1990.04.30 | Colombia | Apostolic Vicariate of Quibdó was promoted as Diocese of Quibdó (became suffragan of Santa Fe de Antioquia) |
| 1990.05.21 |  Bangladesh | Diocese of Rajshahi was established (from Diocese of Dinajpur and became suffragan of Dhaka) |
| 1990.05.21 |  Kenya | Diocese of Kisumu was promoted as Metropolitan Archdiocese of Kisumu (with suffragan sees Bungoma, Eldoret, Kakamega, Kisii and Lodwar) |
| 1990.05.21 | Kenya | Diocese of Mombasa was promoted as Metropolitan Archdiocese of Mombasa (with suffragan see Garissa) |
| 1990.05.21 | Kenya | Diocese of Nyeri was promoted as Metropolitan Archdiocese of Nyeri (with suffragan sees Embu, Marsabit, Meru and Murang’a) |
| 1990.06.09 |  Lebanon | Diocese of Baalbek e Zahlé (Maronite Rite) was renamed as Diocese of Baalbek–Deir Al-Ahmar (lost territory to establish Diocese of Zahlé) |
| 1990.06.09 | Lebanon | Diocese of Batroun–Jbeil (Maronite Rite) was suppressed (to Diocese of Joubbé–Sarba and to establish Diocese of Jbeil) |
| 1990.06.09 | Lebanon | Diocese of Jbeil (Maronite Rite) was restored (from the suppressed Diocese of Batroun–Jbeil and without ecclesiastical province) |
| 1990.06.09 | Lebanon | Diocese of Joubbé (Maronite Rite) was renamed as Diocese of Joubbé–Sarba (gained territory from the suppressed Diocese of Batroun–Jbeil and Diocese of Sarba) |
| 1990.06.09 | Lebanon | Diocese of Sarba (Maronite Rite) was suppressed (to Diocese of Joubbé–Sarba) |
| 1990.06.09 | Lebanon | Diocese of Zahlé (Maronite Rite) was established (from Diocese of Baalbek e Zahlé and without ecclesiastical province) |
| 1990.07.07 |  Myanmar | Apostolic Prefecture of Lashio was promoted as Diocese of Lashio |
| 1990.10.05 |  Argentina | Diocese of San Charbel en Buenos Aires (Maronite Rite) was established (became suffragan of Buenos Aires) |
| 1990.10.31 |  Canada | Diocese of Gatineau–Hull was promoted as Metropolitan Archdiocese of Gatineau–Hull (with suffragan sees Amos, Mont-Laurier and Rouyn-Noranda) |
| 1990.11.19 |  Mozambique | Diocese of Chimoio was established (from Metropolitan Archdiocese of Beira and became suffragan of Beira) |
| 1990.11.19 | Nigeria | Diocese of Nsukka was established (from Diocese of Enugu and became suffragan of Onitsha) |
| 1990.11.19 |  South Africa | Apostolic Prefecture of Ingwavuma was promoted as Apostolic Vicariate of Ingwavuma |
| 1990.11.30 |  Turkiye | Mission sui juris of Trabzon was promoted as Apostolic Vicariate of Anatolia (gained territory from Apostolic Vicariate of Constantinopole) |
| 1990.11.30 | Turkiye | Apostolic Vicariate of Constantinopole was renamed as Apostolic Vicariate of Istanbul (lost territory to Apostolic Vicariate of Anatolia) |
| 1990.12.03 |  Togo | Diocese of Dapango was renamed as Diocese of Dapaong |
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