Marcia Gay Harden (born August 17, 1959 is an American actress born in La Jolla, California. She graduated from the University of Texas with a B.A. in theatre and earned an MFA from the graduate theatre program of New York University. She is married to Thaddaeus Scheel.

She appeared on Broadway in Tony Kushner's Angels in America in 1993 and has appeared in the films Meet Joe Black (1998), Pollock (2000), and Mystic River (2003).