 | 1858 | 1859 | 1860 |  |
Date | Country | Change |
| 1859 |  Turkiye | Diocese of Tokat (Armenian Rite) was established |
| 1859.01.03 |  France | Diocese of Rennes was promoted as Metropolitan Archdiocese of Rennes (with suffragan sees Quimper, Saint-Brieuc and Vannes) |
| 1859.02.02 |  Canada | Diocese of London was renamed as Diocese of Sandwich |
| 1859.04.10 |  Colombia | Diocese of Pasto was established (from Diocese of Popayán and became suffragan of Santafé en Nueva Granada) |
| 1859.04.12 |  Australia | Diocese of Brisbane was established (from Metropolitan Archdiocese of Sydney and became suffragan of Sydney) |
| 1859.06.13 |  Argentina | Diocese of Paraná was established (from Diocese of Buenos Aires and became suffragan of La Plata) |
| 1859.07 |  Italy | Archdiocese of Spoleto lost territory to Diocese of Rieti |
| 1859.07.07 |  USA | Diocese of Monterey was renamed as Diocese of Monterey–Los Angeles |
| 1859.09.04 | Italy | Diocese of Catania was promoted as Archdiocese of Catania (without ecclesiastical province) |
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