Oliver! is a stage musical, with book, music and lyrics by Lionel Bart. The musical is based upon the 1838 novel Oliver Twist by Charles Dickens.

Lionel Bart was a British writer and composer of pop music and musicals. He wrote Tommy Steele's "Rock with the Caveman" and was the sole creator of the musical Oliver! (1960). With Oliver! and his work alongside theatre director Joan Littlewood at Theatre Royal, Stratford East, he played an instrumental role in the 1960s birth of the British musical theatre scene after an era when American musicals had dominated the West End.