Anthony Dryden Marshall (born Anthony Dryden Kuser, New York May 30, 1924) is an American theatrical producer who is a former U.S. Marine, C.I.A. intelligence officer, and ambassador. He also is the former vice president of the Vincent Astor Foundation, which was established by his stepfather, Vincent Astor.

Known as Tony, Marshall is the only child of the American philanthropist Brooke Astor and her first husband, New Jersey state senator John Dryden Kuser. Marshall was the stepson of Charles H. Marshall (his mother's second husband, whose surname he adopted at the age of 18), and also of the American millionaire Vincent Astor (his mother's third husband).

By his father's second marriage, he has a half-sister, Suzanne Dryden Kuser (born November 24, 1931), who served with the U.S. Department of State, was an intelligence officer with the Central Intelligence Agency, and has been a consultant to the National Security Agency.