The Slider is the seventh studio album by English rock band T. Rex, and the third since abbreviating their name from Tyrannosaurus Rex. It was released on 21 July 1972 by record labels EMI and Reprise. Two number-one singles, "Telegram Sam" and "Metal Guru", were released to promote the album. Issued at the height of the band's popularity, The Slider received acclaim from critics, and reached number 4 in the UK charts and number 17 in the US.

T. Rex were an English rock band, formed in 1967 by singer-songwriter and guitarist Marc Bolan, who was their leader, frontman and only consistent member. Though initially associated with the psychedelic folk genre, Bolan began to change the band's style towards electric rock in 1969, and shortened their name to T. Rex the following year. This development culminated in 1970 with their first hit single "Ride a White Swan", and the group soon became pioneers of the glam rock movement.