The Diocese of Daejeon (, Hangul: ) is a Latin Catholic diocese of the Catholic Church in South Korea. It is the diocese for Daejeon, South Korea. Augustinus Kim Jong-soo has been appointed its bishop; Stephanus Han Jung-hyun is auxiliary bishop.

History On 23 June 1958 Pope Pius XII erected the apostolic vicariate of Daejeon. The vicariate was made a diocese on 10 March 1962 by Pope John XXIII.

Leadership Ordinaries Apostolic Vicars of Daijeon Adrien-Joseph Larribeau, M.E.P. (1958–1962)

Bishops of Daejeon Adrien-Joseph Larribeau, M.E.P. (1962–1965) Peter Hwang Min Syeng (1965–1984) Joseph Kyeong Kap-ryong (1984–2005) Lazarus You Heung-sik (2005–2021) Augustinus Kim Jong-soo (2022–present)

Coadjutor bishops Lazarus You Heung-sik (2003–2005) Auxiliary bishops Augustinus Kim Jong-soo (2009–2022) Stephanus Han Jung-hyun (2020–present)

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