Truman "Mark" Herron (July 8, 1928 – January 13, 1996) was an American actor and the fourth husband of singer and actress Judy Garland.
Herron appeared in films such as Federico Fellini's 8½ (1963), Girl in Gold Boots (1968) and Eye of the Cat (1969).
Garland put Herron to work as producer of her two London Palladium concerts with her daughter Liza Minnelli in 1964, as well as some appearances in Canada in 1965.
Aside from providing Gerold Frank information for his 1975 biography Judy, Herron remained silent on the topic of Garland.
Herron had a long-lasting relationship with fellow actor Henry Brandon, which was only briefly interrupted by his marriage to Garland.