Joanna Barnes was an American actress and writer.
Barnes's first appearance on television was in the episode "The Man Who Beat Lupo" on Ford Theatre. She made guest appearances on many television series, including 77 Sunset Strip, Maverick, Have Gun - Will Travel, Colt .45, 21 Beacon Street, The Beverly Hillbillies. and Richard Diamond, Private Detective. She also guest-starred on The Untouchables. Barnes played Peter Falk's former wife on the 1965–1966 CBS series The Trials of O'Brien and was host of the ABC daytime talk show Dateline: Hollywood in 1967.
She appeared in both the original film The Parent Trap and its reboot.
Barnes died April 29, 2002, at The Sea Ranch, California. She was 87.