Alex North (December 4, 1910 – September 8, 1991) was an American composer who wrote the first jazz-based film score (A Streetcar Named Desire) and one of the first modernist scores written in Hollywood (Viva Zapata!).
Born Isadore Soifer in Chester, Pennsylvania, North was an original composer probably even by the classical music standards of the day. However, he managed to integrate his modernism into typical film music leitmotif structure, rich with themes. One of these became the famous song, "Unchained Melody". Nominated for 14 Oscars but unsuccessful each time, North and Ennio Morricone are the only film composers to receive the Lifetime Achievement Academy Award. North's frequent collaborator as orchestrator was the avant-garde composer Henry Brant. He won the 1968 Golden Globe award for his music to The Shoes of the Fisherman.

His best-known film scores include The Rainmaker (1956), Spartacus (1960), The Misfits (1961),The Children's Hour (1961) Cleopatra (1963), Who's Afraid of Virginia Woolf? (1966), and The Devil's Brigade (1968). His commissioned score for Stanley Kubrick's 2001: A Space Odyssey (1968) was discarded by the director, but has since been released on CD.
Though North is best known for his work in Hollywood, he spent years in New York writing music for the stage; he composed the score, by turns plaintive and jarring, for the original Broadway production of Death of a Salesman. It was in New York that he met Elia Kazan (director of Salesman), who brought him to Hollywood in the '50s. North was one of several composers who brought the influence of contemporary concert music into film, in part marked by an increased use of dissonance and complex rhythms. But there is also a lyrical quality to much of his work which may be connected to the influence of Aaron Copland, with whom he studied.

His classical works include a Rhapsody for Piano, Trumpet obbligato and Orchestra. He was nominated for a Grammy Award for his score for the 1976 television miniseries Rich Man, Poor Man. North is also known for his opening to the CBS television anthology series Playhouse 90.