Kathleen Chalfant (born January 14, 1945) is an American actress.
Chalfant worked as a Production Coordinator at Playwrights Horizons in the mid-1970s, beginning with Demons: A Possession by Robert Karmon. She made her Off-Broadway acting debut in Cowboy Pictures in June 1974. She has since appeared in over three dozen Off-Broadway productions.
Chalfant was nominated for the 1993 Tony Award as Best Actress (Featured Role - Play) in Tony Kushner's Angels in America: Millennium Approaches. She earned the Outer Circle Critics, Drama Desk, Obie and Lucille Lortel awards for her performance as Vivian Bearing in Margaret Edson's Pulitzer Prize-winning play Wit in 1998. For her 2003 performance in Alan Bennett's Talking Heads, Chalfant won a second Obie award.
Chalfant has played recurring roles in a number of television series including House of Cards, Law & Order, Rescue Me, and The Guardian. Her roles in feature films have included Isn't It Delicious and Kinsey. Chalfant currently plays Margaret Butler in The Affair on Showtime.