Billy Budd, Op. 50, is an opera by Benjamin Britten to a libretto by the novelist E. M. Forster and Eric Crozier, based on the short novel Billy Budd by Herman Melville. Originally in four acts, the opera received its premiere at the Royal Opera House (ROH), London, on 1 December 1951. Britten later revised the work into a two-act opera, with a prologue and an epilogue. The revised version received its first performance at the ROH, Covent Garden, London, on 9 January 1964.

Edward Benjamin Britten, Baron Britten was an English composer, conductor, and pianist. He was a central figure of 20th-century British music, with a range of works including opera, other vocal music, orchestral and chamber pieces. His best-known works include the opera Peter Grimes (1945), the War Requiem (1962) and the orchestral showpiece The Young Person's Guide to the Orchestra (1945).