Martin Charnin (born November 24, 1934) is an American lyricist, writer, and theatre director. Charnin's best-known work is as conceiver, director and lyricist of the musical Annie.
Born in New York City, Charnin graduated from The High School of Music & Art and then from The Cooper Union, where he earned a BFA. Charnin began his theatrical career as a performer, appearing as "Big Deal", one of the Jets in the original production of West Side Story. He played the role for 1000 performances on Broadway and on the road.
He wrote music and lyrics for numerous Off-Broadway and cabaret revues, many of them for Julius Monk. He then went on to write, direct, and produce nightclub acts for Dionne Warwick, Nancy Wilson, Mary Travers, Larry Kert, Jose Ferrer, and Leslie Uggams.
The first Broadway musical for which he wrote the lyrics was the 1963 musical Hot Spot starring Judy Holliday, with music by Mary Rodgers. He contributed lyrics to Vernon Duke's musical Zenda which ran in California in 1963 but did not reach Broadway. In 1967, he wrote the lyrics for Mata Hari, which was produced by David Merrick. He wrote lyrics to Richard Rodgers' music and Peter Stone's book for the musical Two by Two (1970), which starred Danny Kaye and ran on Broadway for 10 months.