Cathy O'Donnell (6 Julie 1923 – 11 April 1970) was 'n Amerikaanse aktrise. Sy was bekend vir haar rolle in die rolprente The Best Years of Our Lives (1946), They Live by Night (1948), Side Street (1950), en Ben-Hur (1959). 1946: The Best Years of Our Lives 1947: Bury Me Dead 1948: They Live by Night 1948: The Amazing Mr. X 1950: Side Street 1951: Detective Story 1951: Never Trust a Gambler 1952: The Woman's Angle 1954: Eight O'Clock Walk 1955: Mad at the World 1955: The Man from Laramie 1957: The Deerslayer 1958: My World Dies Screaming 1959: Ben-Hur Cathy O'Donnell in die Internet-rolprentdatabasis