OK Computer is the third album by the English rock band Radiohead, released in 1997. It reached #1 on the UK Albums Chart and marked Radiohead's highest entry into the American market at the time, where it debuted at #21. OK Computer expanded the band's worldwide popularity, becoming the last Radiohead album to have a delayed release outside of the United Kingdom. As of 2007, it has been certified triple platinum in the UK and double platinum in the US. OK Computer included the singles "Paranoid Android", "Karma Police" and "No Surprises".

The album was recorded in rural Oxfordshire and Bath, England with Nigel Godrich, who would work with the band on all their future recordings. Although OK Computer was dominated by guitar, its expansive sound and wide range of influences set it apart from the Britpop and alternative rock styles popular at the time, laying the groundwork for Radiohead's later, more experimental work. The album's artwork, by Yorke and frequent collaborator Stanley Donwood, emphasised themes such as consumerism, social disconnection, political stagnation and modern malaise, though the band denied they set out to make a concept album.

OK Computer has received great acclaim from the public and critics. It is often cited as Radiohead's best work and as a landmark album of its time. In 1998, it was nominated for a Grammy Award as Album of the Year, and won for Best Alternative Music Album.