 | 1862 | 1863 | 1864 |  |
Date | Country | Change |
| 1863 |  Czechia | Diocese of Brno exchanged territory with Metropolitan Archdiocese of Olomouc |
| 1863 | Czechia | Metropolitan Archdiocese of Olomouc exchanged territory with Diocese of Brno |
| 1863 |  Turkiye | Diocese of Gazireh (Syriac Rite) was established |
| 1863.01.26 |  Mexico | Diocese of Guadalajara was promoted as Metropolitan Archdiocese of Guadalajara (with suffragan sees Durango, Linares and Zacatecas and lost territory to establish Diocese of Zacatecas) |
| 1863.01.26 | Mexico | Diocese of León was established (from Diocese of Michoacán and became suffragan of Michoacán) |
| 1863.01.26 | Mexico | Diocese of Michoacán was promoted as Metropolitan Archdiocese of Michoacán (with suffragan sees León, Querétaro, San Luis Potosí and Zamora and lost territory to establish Diocese of León, Diocese of Querétaro and Diocese of Zamora) |
| 1863.01.26 | Mexico | Diocese of Querétaro was established (from Metropolitan Archdiocese of México and Diocese of Michoacán and became suffragan of Michoacán) |
| 1863.01.26 | Mexico | Diocese of Tulancingo was established (from Metropolitan Archdiocese of México and became suffragan of México) |
| 1863.01.26 | Mexico | Diocese of Zacatecas was established (from Diocese of Guadalajara and Diocese of San Luis Potosí and became suffragan of Guadalajara) |
| 1863.01.26 | Mexico | Diocese of Zamora was established (from Diocese of Michoacán and became suffragan of Michoacán) |
| 1863.02.06 |  Gabon | Apostolic Vicariate of Deux Guinées et Sénégambie was renamed as Apostolic Vicariate of Deux Guinées (lost territory to establish Apostolic Vicariate of Senegambia) |
| 1863.02.06 |  Senegal | Apostolic Vicariate of Senegambia was established (from Apostolic Vicariate of Deux Guinées et Sénégambie) |
| 1863.03.07 |  Venezuela | Diocese of Barquisimeto was established (from Diocese of Mérida and became suffragan of Caracas) |
| 1863.03.07 | Venezuela | Diocese of Calabozo was established (from Metropolitan Archdiocese of Caracas and Diocese of Mérida and became suffragan of Caracas) |
| 1863.03.16 | Mexico | Diocese of Chilapa was established (from Metropolitan Archdiocese of México, Metropolitan Archdiocese of Michoacán and Diocese of Puebla–Tlaxcala and became suffragan of México) |
| 1863.03.19 | Mexico | Diocese of Veracruz–Jalapa was established (from Diocese of Puebla–Tlaxcala and became suffragan of México) |
| 1863.03.27 |  Fiji | Apostolic Prefecture of Fiji Island was established (from Apostolic Vicariate of Central Oceania) |
| 1863.09.22 | Mexico | Diocese of Yucatán lost territory to Metropolitan Archdiocese of Guatemala |
| 1863.12.14 |  Canada | Apostolic Vicariate of British Columbia was established (from Diocese of Vancouver Island and became suffragan of Québec) |
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