Apostolic Prefecture of Ulaanbaatar Praefectura Apostolica Ulaanbaatarensis Улаанбаатар хот дахь Элч нарын эрх мэдэлд суурилсан шашны засаг захиргаа ᠤᠯᠠᠭᠠᠨᠪᠠᠭᠠᠲᠤᠷ ᠬᠣᠲᠠ ᠳ᠋ᠠᠬᠢ ᠡᠯᠴᠢ ᠨᠠᠷ ᠤᠨ ᠡᠷᠬᠡ ᠮᠡᠳᠡᠯ ᠳᠦ ᠰᠠᠭᠤᠷᠢᠯᠠᠭᠰᠠᠨ ᠱᠠᠰᠢᠨ ᠤ ᠵᠠᠰᠠᠭ ᠵᠠᠬᠢᠷᠭᠠ | |
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 Cathedral of St Peter and St Paul, Ulaanbaatar | |
| Location | |
| Country | Mongolia |
| Metropolitan | Immediately subject to the Holy See |
| Statistics | |
| Area | 1,566,500 km2 (604,800 sq mi) |
| Population - Total - Catholics | (as of 2014) 3,227,000 919 (0.03%) |
| Parishes | 6 |
| Information | |
| Denomination | Roman Catholic |
| Rite | Latin Rite |
| Cathedral | Cathedral of St Peter and St Paul, Ulaanbaatar |
| Current leadership | |
| Pope | Francis |
| Prefect Apostolic | Cardinal Giorgio Marengo I.M.C. |
| Website | |
| Website of the Prefecture | |
The Apostolic Prefecture of Ulaanbaatar (Latin: Praefectura Apostolica Ulaanbaatarensis) is a Roman Catholic Latin apostolic prefecture (pre-diocesan missionary jurisdiction) located in Mongolia, with its territory consisting of the entire country.
Its cathedral episcopal see is the Cathedral of Saints Peter and Paul, in the capital city of Mongolia, Ulaanbaatar.
It is exempt, i.e. directly subject to the Holy See, not part of any ecclesiastical province.
On 28 August 2016, the Apostolic Prefecture of Ulaanbaatar celebrated the ordination of the first native Mongolian priest by Msgr. Wenceslao Padilla. Other seminarians are studying currently in South Korea.