Jo Ann Pflug (born May 2, 1940) is an American film and television actress.
Pflug graduated from Winter Park High School, Rollins College, and the University of Miami, receiving her BA in broadcasting and her minor in American history. She had a weekly radio show called The Magic Carpet, where she was the storyteller, and for four years hosted a weekly live interview talk show called Montage. Her background of interviewing led her to be the first woman to have a live weekly TV talk show in the late 1960s in Los Angeles, on KHJ-TV (channel 9).
Pflug's first major role was as U.S. Army nurse Lt. Maria "Dish" Schneider in the 1970 film MASH. Also in 1970, she starred in an episode of Marcus Welby, M.D. entitled "To Carry the Sun in a Golden Cup", where she played an ailing nurse. She also appeared in Catlow (1971) with Yul Brynner, and Where Does It Hurt? (1972) starring Peter Sellers. Her other notable roles include the voice of Invisible Girl in the 1967 animated version of Fantastic Four, Lt. Katherine O'Hara in the television series spin-off of Operation Petticoat, Boss Jack's wife in Traveller (1997), and Cynthia Vaughn in 1997's Midnight in the Garden of Good and Evil (her last role to date).