 | 1885 | 1886 | 1887 |  |
Date | Country | Change |
| 1886 |  Angola | Apostolic Prefecture of Lower Congo was renamed as Apostolic Prefecture of Lower Congo in Cubango |
| 1886 |  France | Diocese of Fréjus lost territory to Diocese of Nice |
| 1886 |  Italy | Diocese of Cuneo lost territory to Diocese of Ventimiglia |
| 1886 | Italy | Diocese of Ventimiglia lost territory to Diocese of Nice |
| 1886.01.25 |  Egypt | Apostolic Prefecture of Delta del Nilo was established (from Apostolic Vicariate of Egypt) |
| 1886.02.25 |  Lebanon | Diocese of Bāniyās (Greek-Melkite Rite) was restored (became suffragan of Tyr) |
| 1886.03.27 |  Poland | Diocese of Tarnów lost territory to Diocese of Kraków |
| 1886.05.15 |  Micronesia | Mission sui juris of Eastern Carolines was established (from Apostolic Prefecture of Micronesia) |
| 1886.05.15 | Micronesia | Mission sui juris of Western Carolines was established (from Apostolic Prefecture of Micronesia) |
| 1886.05.28 |  USA | Diocese of Grass Valley was suppressed (to establish Diocese of Sacramento) |
| 1886.05.28 | USA | Diocese of Sacramento was established (from Metropolitan Archdiocese of San Francisco, from the suppressed Diocese of Grass Valley and became suffragan of San Francisco) |
| 1886.06.04 |  Congo-Brazzaville | Apostolic Prefecture of Congo was promoted as Apostolic Vicariate of Congo français (lost territory to Diocese of São Paulo de Loanda and Apostolic Vicariate of Deux Guinées) |
| 1886.06.04 |  South Africa | Apostolic Vicariate of Orange Free State was established (from Apostolic Vicariate of Cape of Good Hope, Eastern District and Apostolic Vicariate of Natal) |
| 1886.06.04 | South Africa | Apostolic Prefecture of Transvaal was established (from Apostolic Vicariate of Natal) |
| 1886.06.08 |  Canada | Diocese of Montréal was promoted as Metropolitan Archdiocese of Montréal (with suffragan sees Saint-Hyacinthe and Sherbrooke) |
| 1886.06.08 | Canada | Diocese of Ottawa was promoted as Metropolitan Archdiocese of Ottawa (with suffragan see Pontiac) |
| 1886.06.28 |  Malaysia | Apostolic Vicariate of Western Siam lost territory to Diocese of Macau 澳門 |
| 1886.08.23 | Canada | Diocese of Arichat was renamed as Diocese of Antigonish |
| 1886.09.01 |  Bangladesh | Apostolic Vicariate of Eastern Bengal was promoted as Diocese of Eastern Bengal |
| 1886.09.01 |  India | Apostolic Vicariate of Agra was promoted as Archdiocese of Agra |
| 1886.09.01 | India | Diocese of Allahabad was established (from the suppressed Apostolic Vicariate of Patna) |
| 1886.09.01 | India | Apostolic Vicariate of Bombay was promoted as Archdiocese of Bombay |
| 1886.09.01 | India | Apostolic Vicariate of Western Bengal was promoted as Archdiocese of Calcutta |
| 1886.09.01 | India | Apostolic Prefecture of Central Bengal was promoted as Diocese of Central Bengal |
| 1886.09.01 | India | Diocese of Cochin was restored (from Apostolic Vicariate of Verapoly and became suffragan of Goa) |
| 1886.09.01 | India | Apostolic Vicariate of Coimbatore was promoted as Diocese of Coimbatore |
| 1886.09.01 | India | Diocese of Daman was established (from Metropolitan Archdiocese of Goa, gained title of Cranganor and became suffragan of Goa) |
| 1886.09.01 | India | Titular Patriarchal See of East Indies was established |
| 1886.09.01 | India | Apostolic Prefecture of French Colonies in India was suppressed (to Archdiocese of Pondicherry) |
| 1886.09.01 | India | Apostolic Vicariate of Hyderabad was promoted as Diocese of Hyderabad |
| 1886.09.01 | India | Apostolic Vicariate of Madras was promoted as Archdiocese of Madras (lost territory to establish Diocese of São Tomé de Meliapor) |
| 1886.09.01 | India | Apostolic Vicariate of Madura and Coromandel Coast was promoted as Diocese of Madurai |
| 1886.09.01 | India | Apostolic Vicariate of Mangalore was promoted as Diocese of Mangalore |
| 1886.09.01 | India | Apostolic Vicariate of Mysore was promoted as Diocese of Mysore |
| 1886.09.01 | India | Apostolic Vicariate of Patna was suppressed (to establish Diocese of Allahabad) |
| 1886.09.01 | India | Apostolic Vicariate of Pondicherry was promoted as Archdiocese of Pondicherry (gained territory from the suppressed Apostolic Prefecture of French Colonies in India) |
| 1886.09.01 | India | Apostolic Vicariate of Poona was promoted as Diocese of Poona |
| 1886.09.01 | India | Apostolic Vicariate of Quilon was promoted as Diocese of Quilon |
| 1886.09.01 | India | Diocese of São Tomé de Meliapor was restored (from Apostolic Vicariate of Madras and became suffragan of Goa) |
| 1886.09.01 | India | Apostolic Vicariate of Verapoly was promoted as Archdiocese of Verapoly (lost territory to establish Diocese of Cochin) |
| 1886.09.01 | India | Apostolic Vicariate of Vizagapatam was promoted as Diocese of Vizagapatam |
| 1886.09.01 |  Pakistan | Apostolic Vicariate of Punjab was promoted as Diocese of Lahore |
| 1886.09.01 |  Sri Lanka,  Maldives | Apostolic Vicariate of Colombo was promoted as Archdiocese of Colombo |
| 1886.09.01 | Sri Lanka | Apostolic Vicariate of Jaffna was promoted as Diocese of Jaffna |
| 1886.09.01 | Sri Lanka | Apostolic Vicariate of Kandy was promoted as Diocese of Kandy |
| 1886.10.04 |  Ecuador | Apostolic Prefecture of Canelos y Macas was established (from Apostolic Vicariate of Napo) |
| 1886.10.08 |  Albania | Diocese of Shkodrë was promoted as Metropolitan Archdiocese of Shkodrë (with suffragan sees Beograd and Pult) |
| 1886.10.23 |  Montenegro | Metropolitan Archdiocese of Bar was demoted as Archdiocese of Bar (without ecclesiastical province) |
| 1886.11.22 |  Congo-Kinshasa | Mission sui juris of Congo Belge was established (from Apostolic Vicariate of Deux Guinées and Apostolic Prefecture of Lower Congo) |
| 1886.11.23 | USA | Apostolic Vicariate of Utah was established (from Metropolitan Archdiocese of San Francisco and became suffragan of San Francisco) |
| 1886.11.26 | USA | Diocese of Syracuse was established (from Diocese of Albany and became suffragan of New York) |
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