Dinah Beth Manoff is an American stage, film and television actress and television director best known for her roles as Elaine Lefkowitz on Soap, Marty Maraschino in the film Grease, Libby Tucker in both the stage and film adaptations of I Ought to Be in Pictures, for which she won a Tony award, and Carol Weston on Empty Nest. Manoff has also starred in numerous television movies and guest starred on various television programs in this timespan. Her film career cooled down during the 1990s but has come back in the 2000s with movies such as The Amati Girls and Bart Got a Room and a co-starring role on State of Grace.
Manoff is daughter to actress Lee Grant and screenwriter Arnold Manoff. Her career has spanned more than three decades. Since 1997, Manoff has been married to Arthur Mortell and currently resides in Bainbridge Island, Washington. She had previously resided in Los Angeles, California and New York City, New York.