Brian Samuel Epstein (pronounced /ˈɛpstaɪn/) (19 September 1934 – 27 August 1967) was a British music entrepreneur, and the manager of The Beatles. He also managed several other musical artists such as Gerry & The Pacemakers, Billy J. Kramer and the Dakotas, Cilla Black and The Remo Four. His management company was named NEMS Enterprises, after his family's music stores, called NEMS (North End Music Stores).

Epstein paid for The Beatles to record a demo in Decca's studios, which Epstein later persuaded George Martin to listen to, as Decca was not interested in signing the band. Epstein was then offered a contract by Martin on behalf of EMI's small Parlophone label, even though they had previously been rejected by almost every other British record company. Martin later explained that Epstein's enthusiasm and his confidence that The Beatles would one day become internationally famous convinced him to sign them.

Epstein died of an accidental drug overdose at his home in London in August 1967. The Beatles' early success has been attributed to Epstein's management and sense of style. Paul McCartney said of Epstein: "If anyone was the Fifth Beatle, it was Brian."