Joan Margaret Tetzel (June 21, 1921 – October 31, 1977) was an American actress.
Joan Tetzel is noted for her performance in Alfred Hitchcock's The Paradine Case, where she played "Judy Flaquer", the daughter of the solicitor played by Charles Coburn in the film. In the movie, she is the confidante and best friend of the wife (Ann Todd) of defense lawyer Anthony Keane (Gregory Peck), and is able to objectively see how Keane is ruining his marriage because of his infatuation with Mrs. Paradine (Alida Valli).
She worked with Alfred Hitchcock in his TV series Alfred Hitchcock Presents. She played "Eve Ross" in the Alfred Hitchcock Presents episode "Guest for Breakfast". She appeared as Marian Stuart, wife of the title character, in the 1963 Perry Mason episode, "The Case of the Decadent Dean." She also made appearances on Thriller and Gunsmoke.
Aside from her movie career, Tetzel was a well-known stage actress. She appeared in the 1940 revival of Liliom, the original stage production of I Remember Mama, and portrayed Nurse Ratched in the stage production of One Flew Over the Cuckoo's Nest on Broadway. As a noted stage actress, her photo appeared on the front cover of Life Magazine on February 16, 1948.
Her first husband was radio producer John E. Mosman. Her second husband was Oscar Homolka (1898–1978), whom she married in 1949.
Tetzel died October 31, 1977, at her home Beri-Be-Dahn, Fairwarp, Sussex, England, aged 56, from cancer.