Daniel Tji Hak Soun (; September 9, 1921 â March 12, 1993) was a bishop of the Roman Catholic Diocese of Wonju.
Daniel Tji Hak Soun was ordained a priest on December 15, 1952.
On March 22, 1965, Pope Paul VI appointed him Bishop of Wonju. He was consecrated bishop on June 29, 1965 by Antonio del Giudice. Co-consecrators were the Bishop Thomas F. Quinlan of the Diocese of Chunchon and Bishop John A. Choi Jae-seon of the Diocese of Busan.
Tji was associated with Kim Chi-ha and was arrested in 1974 alongside five other priests and a nun over allegations of providing financial support to opponents of the government of Park Chung Hee and sentenced to death. He was sympathetic to the April Revolution and was a leader of the urban poor and supported nonviolent resistance to the regime.