Jonas Martin Frost III (born January 1, 1942) is an American politician, who was the Democratic representative to the U.S. House of Representatives for Texas's 24th congressional district from 1979 to 2005. He was married to U.S. Army Major General (Retired) Kathryn Frost until her death in 2006.
Born in Glendale, California, Frost grew up in Fort Worth, Texas. He graduated in 1964 with a bachelor's degrees in journalism and history from the University of Missouri. As a student, Frost was editor of The Maneater, was a member of Zeta Beta Tau, and was tapped by Omicron Delta Kappa and QEBH. He later received his Juris Doctor degree from the Georgetown University Law Center in 1970.
Before going to law school Frost worked as a newspaper reporter. Following his graduation he worked as a law clerk for Federal Judge Sarah T. Hughes of the Northern District of Texas and began a private practice.