Owen DeVol Cox (March 20, 1910 – July 21, 1990) was a United States federal judge.
Born in Joplin, Missouri, Cox received a B.A. from the University of Kansas in 1931 and an LL.B. from the University of Kansas School of Law in 1932. He was in private practice in Corpus Christi, Texas from 1934 to 1942. He was an assistant city attorney of Corpus Christi in 1942, and an assistant state attorney general of Texas in the same year, becoming city attorney of Corpus Christi 1943 to 1944. He was in the United States Army during the later years of World War II, from 1944 to 1945. He was again city attorney of Corpus Christi from 1945 to 1946, thereafter returning to his private practice there until 1970.
On October 7, 1970, Cox was nominated by President Richard Nixon to a new seat on the United States District Court for the Southern District of Texas created by 84 Stat. 294. He was confirmed by the United States Senate on November 25, 1970, and received his commission on December 1, 1970. He assumed senior status on March 20, 1981. Cox served in that capacity until his death, in 1990, in Corpus Christi.