Deborah Harmon (born May 8, 1951 ) is an American film and television actress.

Harmon was born in Chicago, Illinois, the daughter of actor Frank Harmon.. She is probably best remembered for her role as Elizabeth Lubbock in the ABC television series Just the Ten of Us which was a spin-off of Growing Pains where she first appeared in the role for two episodes in 1988. She has also had parts in films such as Bachelor Party (1984) and Back to the Future (1985), and co-starred with Kurt Russell in the 1980 comedy Used Cars.