James Marvin Leath (May 6, 1931 – December 8, 2000) was a U.S. Representative from Texas.

Marvin Leath
Member of the U.S. House of Representatives from Texas's 11th district
In office January 3, 1979 – January 3, 1991
Preceded by	William R. Poage
Succeeded by	Chet Edwards
Personal details
Born	James Marvin Leath (1931-05-06)May 6, 1931 Henderson, Texas, U.S.
Died	December 8, 2000(2000-12-08) (aged 69) Arlington, Virginia, U.S.
Political party	Democratic

Born in Henderson, Texas, Leath attended the Rusk County public schools and graduated from Henderson High School in 1949. He attended Kilgore Junior College. B.B.A., University of Texas, Austin, 1954. He served in the United States Army from 1954 to 1956 achieving the rank of first lieutenant. Coached football and track, Henderson High School from 1957 to 1959. Business salesman, 1959. Banking, 1962. Officer and director in five Texas banks, and two manufacturing companies. He served as special assistant to United States Representative William R. Poage from 1972 to 1974.

Leath was elected as a Democrat to the Ninety-sixth and to the five succeeding Congresses (January 3, 1979 – January 3, 1991). He was not a candidate for renomination in 1990 to the One Hundred Second Congress. He died on December 8, 2000, in Arlington, Virginia.