Mary Elizabeth 'Sissy' Spacek (born December 25, 1949) is an American actress and singer. She is the recipient of numerous accolades, including an Academy Award, three Golden Globe Awards, a Screen Actors Guild Award, and nominations for four British Academy Film Awards, three Primetime Emmy Awards, and a Grammy Award. Spacek was honored with a star on the Hollywood Walk of Fame in 2011.

Born and raised in Texas, she initially aspired to a career as a recording artist. In 1968, at age 18, she recorded a single, "John, You Went Too Far This Time," under the name Rainbo. She began her professional acting career in the early 1970s, making her debut as an extra in Andy Warhol's Women in Revolt (1971). Her breakout role came with Terrence Malick's influential crime film Badlands (1973), which earned her a nomination for the British Academy Film Award for Most Promising Newcomer to Leading Film Roles. She rose to international prominence with her portrayal of Carrie White in Brian De Palma's horror film Carrie (1976), for which she received her first nomination for the Academy Award for Best Actress. After appearing in the acclaimed films Welcome to L.A. (1976) and Robert Altman's 3 Women (1977), she won the Academy Award for Best Actress for her portrayal of Loretta Lynn in the biographical musical film Coal Miner's Daughter (1980).