The Goodbye Girl is a musical with a book by Neil Simon, lyrics by David Zippel, and music by Marvin Hamlisch, based on Simon's original screenplay for the 1977 film of the same name.

Marvin Neil Simon was an American playwright, screenwriter and author. He wrote more than 30 plays and nearly the same number of movie screenplays, mostly film adaptations of his plays. He received three Tony Awards and a Golden Globe Award, as well as nominations for four Academy Awards and four Primetime Emmy Awards. He was awarded a Special Tony Award in 1975, the Kennedy Center Honors in 1995 and the Mark Twain Prize for American Humor in 2006.