The Roman Catholic Diocese of Taejon is a diocese of the Latin Rite of the Roman Catholic church in South Korea. Erected in 1958 as an Apostolic vicariate, the vicariate was raised to be a diocese in 1962. It is the diocese for Daejeon, South Korea. Nazarius Heung-sik Yoo is its bishop; Augustinus Kim Jong Soo is the auxiliary bishop.