Chase Addison Clark (August 21, 1883 – December 30, 1966) was an American jurist who served as the 18th governor of Idaho and was a United States district judge of the United States District Court for the District of Idaho.

Clark was born on August 21, 1883, in Hadley, Indiana, the son of Eunice (Hadley) and Joseph Addison Clark.^[1] He arrived in eastern Idaho Territory in 1884. His father engineered an early canal on the Snake River and later became the first Mayor of Idaho Falls, Idaho in 1900.^[2] Clark attended the public schools and left Idaho Falls High School at age 15 and then attended school in Terre Haute, Indiana.^[3][4] Clark returned to Idaho Falls working as a mercantile clerk, then moved to Mackay, Idaho shortly after its founding and saved money to attend the University of Michigan Law School,^[3] but did not graduate but instead read law to enter the bar in 1904.^[5][6] He entered private practice in Mackay from 1904 to 1930. He was a Judge Advocate General for the State of Idaho from 1914 to 1915. Clark left to fight in 1916 in the Border War and then World War I.^[2] He served in a machine gun unit and achieved the rank of lieutenant^[7] in the United States Army. He was a member of the Idaho House of Representatives from 1913 to 1916.^[8] He returned to private practice in Idaho Falls from 1930 to 1940.^[8] He served in the Idaho Senate from 1933 to 1936.^{[citation needed]} He was the Mayor of Idaho Falls from 1937 to 1938. He was the Governor of Idaho from 1941 to 1942.^[8]

Clark was nominated by President Franklin D. Roosevelt on February 18, 1943, to a seat on the United States District Court for the District of Idaho vacated by Judge Charles Cheatham Cavanah.^[10] He was confirmed by the United States Senate on March 5, 1943, and received his commission on March 10, 1943.^[11][12] He served as Chief Judge from 1954 to 1964.^[8] He assumed senior status on April 30, 1964.^[8] His service terminated on December 30, 1966, due to his death.^[8]

Clark married Jean Elizabeth Burnett, the 18-year-old daughter of a Mackay merchant,^[13] on January 10, 1906.^[14]

Clark was a member of a prominent Idaho political family.^{[citation needed]} He was the younger brother of Barzilla W. Clark (1880–1943), who preceded him as governor (1937–1939), and was the father-in-law of Frank Church (1924–1984), a four-term United States Senator (1957–1981) and presidential candidate in 1976.^{[citation needed]} A nephew, David Worth Clark (1902–1955), also represented Idaho in both houses of United States Congress. Clark's daughter, Bethine Clark Church (1923–2013), remained active in Idaho Democratic politics until her death.^{[citation needed]}

Clark suffered a stroke at age 83 in December 1966,^[15] and spent his final weeks at St. Luke's Hospital in Boise, Idaho. He died on December 30,^[2][16] and was interred at Rose Hill Cemetery in Idaho Falls.^{[17][18][2][16]}