Clarence James Duhart, CSsR (March 23, 1912 – September 21, 1998) was an American born bishop in the Catholic Church.
He attended novitiate in De Soto, Missouri where he professed religious vows as a Redemptorist in the St. Louis Province.
He studied for the priesthood at Immaculate Conception Seminary in Oconomowoc, Wisconsin and was ordained there on June 29, 1937.
He was consecrated a bishop by Archbishop Michel Kien Samophithak of Thare and Nonseng on April 21, 1966.
He served the Diocese of Udon Thani for ten years before his resignation was accepted by Paul VI on October 2, 1975.