Joan Hume McCracken (December 31, 1917 – November 1, 1961) was an American dancer and actress who became famous for her role as Sylvie ("The Girl Who Falls Down") in the original 1943 production of Oklahoma! She also was noted for her performances in the Broadway shows Bloomer Girl (1944), Billion Dollar Baby (1945) and Dance Me a Song (1950), and the films Hollywood Canteen (1945) and Good News (1947).

McCracken was a trendsetter in musical comedy dance. In her Oklahoma! role, she became an instant sensation for a carefully choreographed pratfall during the "Many a New Day" dance number. She was considered an innovator in combining dance with comedy, and branched into dramatic roles on Broadway and early television. However her career was cut short, ending several years before her death at age 43, as she suffered complications from diabetes.

McCracken was generous in promoting the careers of other dancers, including Shirley MacLaine, and was a strong influence on her second husband, Bob Fosse, encouraging him to become a choreographer. She was noted for unconventional behavior and was one of a number of real-life counterparts to inspire the character of Holly Golightly in her friend Truman Capote's novella Breakfast at Tiffany's.