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)