The Diocese of Udon Thani (Dioecesis Udonthaniensis, ) is a Latin Catholic ecclesiastical jurisdiction in northeast Thailand. It is a suffragan diocese of the archdiocese of Thare and Nonseng.
The diocese covers an area of 50,046 kmò, covering five provinces of Thailand: Khon Kaen, Loei, Nongbua Lamphu, Nong Khai, and Udon Thani. As of 2001, of the 5.3 million citizens, 5,612 are members of the Catholic Church. It is divided into 56 parishes, having 31 priests altogether.
The Prefecture Apostolic of Udonthani was created on May 7, 1953, when the Vicariate Apostolic of Thare was split. On December 18, 1965 the Prefecture Apostolic was elevated to a diocese.
The Cathedral of Our Mother of Perpetual Help (Thai: à ¸Âà ¸²à ¸ªà ¸Âà ¸§à ¸´à ¸«à ¸²à ¸£à ¸Âà ¸£à ¸°à ¸¡à ¸²à ¸£à ¸Âà ¸²à ¸Âà ¸´à ¸Âà ¸Âà ¸²à ¸Âà ¸¸à ¹Âà ¸Âà ¸£à ¸²à ¸°à ¸«à ¹Â) is located in Udon Thani town.
The bishops have included: