Mary Lucy Denise Henner (born April 6, 1952) is an American actress, producer, radio host, and author. She began her career appearing in the original production of the musical Grease in 1971, before making her screen debut in the 1977 comedy-drama film Between the Lines.

In 1977, Henner was cast in her breakthrough role as Elaine O'Connor Nardo in the ABC/NBC sitcom Taxi, a role she played to 1983 and received five Golden Globe Award nominations. She later has had co-starring roles in films such as Hammett (1982), The Man Who Loved Women (1983), Cannonball Run II (1984), Johnny Dangerously (1984), Rustlers' Rhapsody (1985), L.A. Story (1991), and Noises Off (1992). She returned to television with a starring role in the CBS sitcom Evening Shade (1990–94), and later had leading roles in many made-for-television movies.