"Supercollider" and "The Butcher" are songs by the English rock band Radiohead, released as a double A-side in April 2011 for Record Store Day and June in North America.

The Radiohead singer, Thom Yorke, first performed "Supercollider" solo on 6 June 2008 at Malahide Castle, Dublin.

[6] Writing for Rolling Stone, Rob Sheffield described the songs as "superb electro ballads" that would have fit the "moodier second half" of The King of Limbs, and awarded the single 4 out of 5.

[7] In 2021, the Stereogum writer Chris DeVille wrote that "Supercollider" was "the kind of epic that can work as an album’s centrepiece and spine", and that "The Butcher" combined dance beats with "Radiohead’s most dirge-like tendencies in fascinating ways".

[8] He speculated that The King of Limbs would be a fan favourite had it included the songs along with "The Daily Mail" and "Staircase", also released that year.