The Diocese of Saint Joseph at Irkutsk () is a Latin Church diocese of the Catholic Church located in the city of Irkutsk, which is part of the ecclesiastical province of the Mother of God at Moscow in Russia. The Diocese of Irkutsk is the largest geographical Catholic bishopric on earth, covering an area of 9,960,000 km2. The Catholic population of the diocese is estimated to be about 53,000 persons. It has 42 parishes served by about 42 priests. The bishop is Cyryl Klimowicz, a Pole. The diocese is divided into five deaneries: Irkutsk, Krasnoyarsk, Yakutsk, Vladivostok and Magadan.
History
May 18, 1999: Established as Apostolic Administration of Siberia Orientale from Apostolic Administration of Siberia February 11, 2002: Promoted as Diocese of Saint Joseph (located at San Giuseppe an Irkutsk)
Special churches
Former cathedral
Church of the Most Holy Mother of God in Vladivostok, Russia
Episcopal ordinaries
(all Roman Rite)
Apostolic Administrators of Siberia Orientale
Jerzy Mazur, SVD (18 May 1999 – 11 February 2002)
Bishops of Saint Joseph at Irkutsk
Jerzy Mazur, SVD (11 February 2002 – 17 April 2003) Cyryl Klimowicz (17 April 2003 – )