Marcia Gay Harden (born August 14, 1959) is an accomplished American actress whose career spans several decades. She had her breakthrough in 1990 with the Coen brothers' film Miller's Crossing. Her remarkable portrayal of artist Lee Krasner in the 2000 biographical film Pollock earned her the Academy Award for Best Supporting Actress. Harden received further acclaim and her second Academy Award nomination for her role as a troubled wife in the drama film Mystic River (2003). Notable roles include The First Wives Club (1996), Flubber (1997), Space Cowboys (2000), Mona Lisa Smile (2003), and the Fifty Shades film series (2015–2018).

Harden made her Broadway debut in 1993 in Angels in America: Millennium Approaches/Angels in America: Perestroika, earning her a Tony Award nomination for Best Featured Actress in a Play. She earned her Tony Award for Best Actress in 2009 for her performance in the comedic play God of Carnage. Her television credits span from guest roles in HBO's The Newsroom, ABC's How to Get Away with Murder, Apple TV+'s The Morning Show, to main roles in CBS series Code Black and So Help Me Todd. She has also received Emmy Award nominations for her performances in Law & Order: Special Victims Unit and The Courageous Heart of Irena Sendler (2009).