Martin Charnin (b. 24 November 1934) is an American theatre director, lyricist, and composer.

He was born in New York, and appeared as one of the Jets in the musical West Side Story.

His best-known work is as lyricist on the musical Annie.

• West Side Story – actor – 1959
• The Girls Against the Boys – actor, composer, lyricist - 1959
• West Side Story – actor – 1960
• Hot Spot – lyricist (music by Mary Rodgers) – 1963
• La Strada – additional lyrics - 1969
• Two By Two – lyricist (music by Richard Rodgers) – 1971
• A Celebration of Richard Rodgers – lyricist – 1972
• Nash at Nine – director – 1973
• Annie – lyricist, director (music by Charles Strouse) – 1977
• I Remember Mama – lyricist (music by Richard Rodgers) – 1979
• The Madwoman of Central Park West – lyricist – 1979
• The First – lyricist, director – 1981
• A Little Family Business – director - 1982
• Cafe Crown – director – 1989
• Sid Caesar & Company - director - 1989
• Annie – director, lyricist (music by Charles Strouse) - 1997
• The Flowering Peach – director - 1997