Grace Patricia Kelly (November 12, 1929 – September 14, 1982) was an American film actress who, after starring in several significant films in the early to mid-1950s, became Princess of Monaco by marrying Prince Rainier III in April 1956.

After graduating from the American Academy of Dramatic Arts in 1949, she began appearing in New York City theatrical productions and more than 40 episodes of live drama productions broadcast during the early 1950s Golden Age of Television. In 1953, she gained stardom from her performance in John Ford's adventure-romance Mogambo, starring Clark Gable and Ava Gardner, which won her a Golden Globe Award and an Academy Award nomination. In 1954, she won the Academy Award for Best Actress for her performance in the drama The Country Girl with Bing Crosby. Other noteworthy films in which she starred include the western High Noon (1952) with Gary Cooper, the romance-comedy musical High Society (1956) with Bing Crosby and Frank Sinatra, and three Alfred Hitchcock suspense thrillers in rapid succession: Dial M for Murder (1954) with Ray Milland, Rear Window (1954) with James Stewart, and To Catch a Thief (1955) with Cary Grant.

Kelly retired from acting at age 26 to marry Rainier, and she began her duties as Princess of Monaco. Hitchcock hoped that she would appear in more of his films which required an "icy blonde" lead actress, but he was unable to coax her out of retirement. The Prince and Princess had three children: Princess Caroline, Prince Albert, and Princess Stéphanie. Princess Grace retained her link to America by her dual U.S. and Monégasque citizenship. Her charity work focused on young children and the arts, establishing the Princess Grace Foundation to support local artisans in 1964. Her organization for children's rights, AMADE Mondiale, gained consultive status within UNICEF and UNESCO. She died aged 52 at Monaco Hospital on September 14, 1982, succumbing to injuries sustained in a car crash the previous day. She is listed 13th among the American Film Institute's 25 Greatest Female Stars of Classical Hollywood Cinema.