The Roman Catholic Diocese of Daejeon (Latin: Dioecesis Taeieonensis, Hangul: 천주교 대전교구) is a diocese of the Latin Church of the Catholic Church in South Korea.

Augustinus Kim Jong-soo has been appointed its bishop; Stephanus Han Jung-hyun is auxiliary bishop.

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.

This article on a Roman Catholic diocese in Asia is a stub.