Funny Girl is a musical with a book by Isobel Lennart, music by Jule Styne, and lyrics by Bob Merrill.

The semi-biographical plot is based on the life and career of Broadway and film star and comedienne Fanny Brice and her stormy relationship with entrepreneur and gambler Nicky Arnstein. Its original title was My Man.

After seventeen previews, the Broadway production, directed by Garson Kanin and choreographed by Carol Haney under the supervision of Jerome Robbins, opened on March 26, 1964 at the Winter Garden Theatre, subsequently transferring to the Majestic Theatre and the Broadway Theatre to complete its total run of 1348 performances. The original cast included Barbra Streisand, Sydney Chaplin, Kay Medford, Danny Meehan, Jean Stapleton, and Lainie Kazan, who also served as Streisand's understudy. Later in the run, Streisand and Chaplin were replaced by Mimi Hines and Johnny Desmond, and Hines' husband and comedy partner Phil Ford also joined the cast.

The musical was produced by Ray Stark, who was Brice's son-in-law via his marriage to her daughter Frances. The production was nominated for eight Tony Awards, but facing tough competition from Hello, Dolly!, it failed to win in any categories.

The 1966 West End production at the Prince of Wales Theatre, starring Streisand, was directed by Lawrence Kasha.