Tommy is the fourth studio album by the English rock band the Who, released on 19 May 1969. Written primarily by guitarist Pete Townshend, Tommy is a double album and an early rock opera that tells the story of the fictional Tommy Walker and his path to becoming a spiritual leader and messianic figure.

Townshend came up with the concept of Tommy after being introduced to the work of Meher Baba, and he attempted to translate Baba's teachings into music. Recording of the album began in September 1968, but took six months to complete as material needed to be arranged and re-recorded in the studio. The Who promoted the album's release with an extensive tour, including a live version of Tommy, which lasted throughout 1969 and 1970. Key gigs from the tour included appearances at Woodstock, the 1969 Isle of Wight Festival, the University of Leeds, the Metropolitan Opera House, and the 1970 Isle of Wight Festival. The live performances of Tommy drew critical praise and revitalised the band's career.

Upon its release, Tommy was acclaimed by critics, who hailed it as the Who's breakthrough. Its critical standing diminished slightly in later years; nonetheless, several writers view it as an important and influential album in the history of rock music. In 1998, Tommy was inducted into the Grammy Hall of Fame.

Subsequently, the rock opera was developed into other media, including a ballet in Montreal in 1970, a Seattle Opera production in 1971, an orchestral version by Lou Reizner in 1972, a film directed by Ken Russell and featuring Jack Nicholson and Oliver Reed in 1975, and a Broadway musical in 1992.

Tommy has been reissued several times on CD, including a remix by Jon Astley in 1996, a deluxe Super Audio CD in 2003, and a super deluxe box set in 2013, including previously unreleased demos and live material.