Date | Country | Change |
| 1987.01.05 |  Ecuador | Territorial Prelature of Santo Domingo de los Colorados was established (from Metropolitan Archdiocese of Quito and became suffragan of Quito) |
| 1987.01.07 |  Brazil | Diocese of Palmas was renamed as Diocese of Palmas–Francisco Beltrão |
| 1987.02.12 |  Wales,  England | Metropolitan Archdiocese of Cardiff lost territory to Diocese of Menevia |
| 1987.02.12 | Wales | Diocese of Wrexham was established (from Diocese of Menevia and became suffragan of Cardiff) |
| 1987.03.26 |  Australia,  New Zealand | Diocese of Saint Michael’s of Sydney (Greek-Melkite Rite) was established (without ecclesiastical province) |
| 1987.03.26 |  USA,  Canada | Apostolic Exarchate of United States of America (Romanian Rite) was promoted as Diocese of Saint George in Canton (without ecclesiastical province) |
| 1987.03.30 |  Philippines | Diocese of Kabankalan was established (from Diocese of Bacolod and became suffragan of Jaro) |
| 1987.03.30 | Philippines | Diocese of San Carlos was established (from Diocese of Bacolod and Diocese of Dumaguete and became suffragan of Jaro) |
| 1987.04.27 | Canada | Diocese of Labrador–Schefferville was renamed as Diocese of Labrador City–Schefferville |
| 1987.04.27 |  Kenya | Diocese of Bungoma was established (from Diocese of Kakamega and became suffragan of Nairobi) |
| 1987.05.05 |  El Salvador | Diocese of Zacatecoluca was established (from Diocese of San Vicente and became suffragan of San Salvador) |
| 1987.05.15 |  Bangladesh | Diocese of Mymensingh was established (from Metropolitan Archdiocese of Dhaka and became suffragan of Dhaka) |
| 1987.05.15 |  India | Diocese of Nashik was established (from Diocese of Poona and became suffragan of Bombay) |
| 1987.05.15 |  Sri Lanka | Diocese of Kurunegala was established (from Diocese of Chilaw and became suffragan of Colombo) |
| 1987.06.25 | Brazil | Territorial Prelature of Juruá was promoted as Diocese of Cruzeiro do Sul |
| 1987.06.27 | Brazil | Diocese of Imperatriz was established (from Diocese of Carolina and became suffragan of São Luís do Maranhão) |
| 1987.07.03 |  Cameroon | Diocese of Obala was established (from Metropolitan Archdiocese of Yaoundé and became suffragan of Yaoundé) |
| 1987.07.03 |  Cote d’Ivoire | Diocese of Bondoukou was established (from Diocese of Abengourou and became suffragan of Abidjan) |
| 1987.07.03 |  Honduras | Diocese of Trujillo was restored (from Diocese of San Pedro Sula and became suffragan of Tegucigalpa) |
| 1987.07.03 | India | Diocese of Kottapuram was established (from Metropolitan Archdiocese of Verapoly and became suffragan of Verapoly) |
| 1987.07.03 | India | Diocese of Sivagangai was established (from Metropolitan Archdiocese of Madurai and became suffragan of Madurai) |
| 1987.07.07 |  Colombia | Diocese of Málaga–Soatá was established (from Metropolitan Archdiocese of Bucaramanga and Diocese of Duitama and became suffragan of Bucaramanga) |
| 1987.07.13 |  Chile | Diocese of San Bernardo was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1987.07.18 |  South Africa | Diocese of Louis Trichardt–Tzaneen was renamed as Diocese of Tzaneen |
| 1987.09.04 |  Papua New Guinea | Diocese of Daru was renamed as Diocese of Daru–Kiunga |
| 1987.10.03 | Colombia | Apostolic Prefecture of Ariari was promoted as Apostolic Vicariate of Ariari |
| 1987.10.03 |  Congo-Brazzaville | Diocese of Kinkala was established (from Metropolitan Archdiocese of Brazzaville and became suffragan of Brazzaville) |
| 1987.10.31 | Honduras | Territorial Prelature of Inmaculada Concepción de la B.V.M. en Olancho was promoted as Diocese of Juticalpa |
| 1987.11.10 | South Africa | Diocese of Lydenburg–Witbank was renamed as Diocese of Witbank |
| 1987.11.18 |  Nigeria | Diocese of Ahiara was established (from Diocese of Owerri and became suffragan of Onitsha) |
| 1987.11.18 | South Africa | Apostolic Prefecture of Rustenburg was promoted as Diocese of Rustenburg (became suffragan of Pretoria) |
| 1987.11.18 |  Tanzania | Diocese of Mwanza was promoted as Metropolitan Archdiocese of Mwanza (with suffragan sees Bukoba, Geita, Musoma, Rulenge and Shinyanga) |
| 1987.11.18 | Tanzania | Diocese of Songea was promoted as Metropolitan Archdiocese of Songea (with suffragan sees Iringa, Lindi, Mbeya, Mbinga, Mtwara, Njombe and Tunduru–Masasi) |
| 1987.11.30 |  Egypt | Apostolic Vicariate of Heliopolis of Egypt was suppressed (to Apostolic Vicariate of Alexandria of Egypt and united to Apostolic Vicariate of Alexandria of Egypt) |
| 1987.11.30 | Egypt | Apostolic Vicariate of Port-Said was suppressed (to Apostolic Vicariate of Alexandria of Egypt and united to Apostolic Vicariate of Alexandria of Egypt) |
| 1987.12.30 | El Salvador | Diocese of Chalatenango was established (from Metropolitan Archdiocese of San Salvador and became suffragan of San Salvador) |
