Peter Sydney Ernest Lawford (born Peter Sydney Ernest Aylen; 7 September 1923 – 24 December 1984) was a British-American actor, producer, and socialite, who lived in the United States throughout his adult life.

He was a member of the "Rat Pack" and the brother-in-law of President John F. Kennedy. From the 1940s to the 1960s, he was a well-known celebrity and starred in a number of highly acclaimed films. In later years, he was noted more for his off-screen activities as a celebrity than for his acting; it was said that he was "famous for being famous".