Joanne Elizabeth Nail (born June 3, 1947) is an American former film, stage, and television actress. She is best known for her roles in the exploitation film Switchblade Sisters (1975), the science fiction horror film The Visitor (1979), and Larry Cohen's werewolf horror comedy Full Moon High (1981).
Nail also appeared on Broadway in the productions Scratch (1971) and Lysistrata (1972). On television, she guest-starred on numerous series throughout the 1970s and 1980s, including Harry O, The Rockford Files, Young Maverick, and Hawaii Five-O.
Nail was born and raised in Spokane, Washington. She has a fraternal twin brother, Gregory, a physician, and another brother, David, a businessman. She began acting in her youth at the Spokane Civic Theatre and graduated from Lewis and Clark High School. She attended the University of Washington as an art major for three years before graduating with a bachelor's degree in education from Eastern Washington University in 1970.
Nail appeared on Broadway in the productions Scratch (1971) and Lysistrata (1972) before making her feature film debut in the exploitation film Switchblade Sisters (1975), opposite Michael Sarrazin. She subsequently starred in the Italian-American science fiction horror film The Visitor (1979), portraying the mother of a young daughter with telekinesis opposite Mel Ferrer, Shelley Winters, and John Huston. She subsequently had a lead role in Larry Cohen's horror comedy Full Moon High (1981), opposite Adam Arkin.
On television, Nail had guest-starring roles on Marcus Welby, M.D. (1974), The Rockford Files (1977), Hawaii Five-O (1978), and Cagney & Lacey (1988).