Marvin Ivan "Buck" Barrow (March 14, 1903 – July 29, 1933) was a member of the Barrow Gang. He was the older brother of the gang's leader, Clyde Barrow. He and his wife Blanche were wounded in a gun battle with police four months after they joined up with Bonnie and Clyde. Marvin died of his wounds.
Barrow got his nickname from his older brother.