Alan Jay Lerner (August 31, 1918 – June 14, 1986) was an American lyricist and librettist. In collaboration with Frederick Loewe, he created some of the world's most popular and enduring works of musical theatre for both the stage and on film. He won three Tony Awards and three Academy Awards, among other honors.

Born in New York City, he was the son of Joseph Jay Lerner, the brother of the owner of the Lerner Stores, a chain of dress shops. The founder and owner of Lerner Stores was Samuel Alexander Lerner. Alan Jay Lerner was educated at Bedales School, Choate Rosemary Hall, and Harvard, where he was a classmate of John F. Kennedy, with whom he edited the yearbook. Like Cole Porter at Yale and Richard Rodgers at Columbia, his career in musical theater began with his collegiate contributions, in Lerner's case to the annual Harvard Hasty Pudding musicals.

Following graduation, Lerner wrote radio scripts, including Your Hit Parade, until he was introduced to Austrian composer Frederick Loewe, who needed a lyricist, in 1942. Their first collaboration was a musical adaptation of Barry Connor's farce The Patsy called Life of the Party for a Detroit stock company. It enjoyed a nine-week run and encouraged the duo to join forces with Arthur Pierson for What's Up?, which opened on Broadway in 1943. It ran for 63 performances and was followed two years later by The Day Before Spring. One of Broadway's most successful partnerships had been established.