Sherry Dempsey is a recurring character on NBC series Frasier. She is portrayed by Marsha Mason.
Sherry is a waitress at Martin's favorite bar, McGinty's and they date in seasons 4-5. Sherry shares many interests with Martin; Frasier and Niles dislike her but for the sake of their father continue to tolerate her. Sherry is loud, fun-loving and boisterous. In the episode "Three Dates and a Break Up", Sherry and Martin break up over a small argument one morning. Sherry confides in Frasier, despite his relief at not having Sherry around the house anymore, Frasier can't work out how or why the breakup happened but Martin tells him the night before the break up, Martin told Sherry that he loved her - Sherry and Martin later got back together after they talked about it.
When Daphne finds an engagement ring in Martin's drawer, Frasier and Niles are shocked at the thought of Sherry taking their mother's place, so Niles hires a personal investigator to check up on Sherry, and the brothers are shaken to discover she has been married several times. Frasier and Niles tell Martin this, but Martin already knew as Sherry had told him in the second week of their relationship. They break up later because they both want different things - Martin wants to marry her, while Sherry wants to keep the relationship at a lower level; Sherry and Martin agree to remain good friends, although she is neither seen nor mentioned again.