Margo Martindale (born July 18, 1951) is an American film, stage, and television actress. In 2011, she won an Emmy Award for her role as Mags Bennett on Justified. She has played supporting roles in several films, including The Hours, Million Dollar Baby as Hilary Swank's character's mother, The Firm, Lorenzo's Oil, Marvin's Room, The Savages, and Paris, je t'aime. She was also nominated for a Tony Award for Best Featured Actress in 2004.

Margo Martindale was born July 18, 1951, in Jacksonville, Texas, to parents William Everett and Margaret (Pruitt) Martindale. In addition to owning and operating a lumber company in Jacksonville, her father was known as a champion dog handler in Texas and throughout the southern United States. Margo was the youngest of three children and only daughter. Her oldest brother is professional golfer and golf course designer Billy Martindale. Middle child, brother Bobby Tim, died in 2004. Margo Martindale participated in golf, cheerleading and drama while in school and was crowned "Football Sweetheart" as well as "Miss Jacksonville High School 1969."  Following graduation from Jacksonville High School in 1969, Martindale attended Lon Morris College, then transferred to the University of Michigan at Ann Arbor. While at Michigan, she also did summer study at Harvard University, appearing onstage with future movie and TV stars Jonathan Frakes and Christopher Reeve.