"I'm the Greatest Star" is a popular song from the 1964 musical Funny Girl. The show tune was composed by written by Jule Styne with lyrics by Bob Merrill. Barbra Streisand performed it in the role of Fanny Brice, first in the Broadway cast, then again in the 1968 film adaptation. The song was first included on the original Broadway cast recording album Funny Girl, which was a best-seller in 1964.