Clark Wallace Thompson (August 6, 1896 – December 16, 1981) was a United States Marine Corps veteran of World War I and World War II, who served 11 terms in the U.S. House of Representatives in the mid-20th century.

Thompson was born in La Crosse, Wisconsin on August 6, 1896, and moved to Oregon in 1901 with his parents, who settled in Cascade Locks.

He remained a United States Marine Corps reservist until 1946 except when he again served on active duty during World War II from 1940 to 1942.

From 1943 to 1945 he was the officer in charge, United States Marine Corps Reserve, and held the rank of colonel.

[2] He was one of the majority of the Texan delegation to decline to sign the 1956 Southern Manifesto opposing the desegregation of public schools ordered by the Supreme Court in Brown v. Board of Education.