Colin Charles Greenwood (born 26 June 1969) is an English bassist and a member of the rock band Radiohead.

Greenwood has contributed to solo projects by the other members of Radiohead, and has collaborated with musicians including Tamino, Gaz Coombes, Nick Cave and Warren Ellis.

[5] As a teenager, Greenwood read historical works such as The Communist Manifesto and Ragged-Trousered Philanthropists and fiction by American writers including Richard Ford and John Cheever.

[6] He credited his older sister, Susan, with introducing him and Jonny to "miserable" bands such as the Fall, Magazine and Joy Division.

[8] Their future bandmates Ed O'Brien, whom Greenwood met during a school production of the opera Trial by Jury, and Philip Selway were also pupils.

When Wozencroft mentioned that he was moving to a position as an A&R scout at the EMI subsidiary Parlophone, Greenwood gave him a copy of On a Friday's latest demo.

[5][18] In 2008, Mojo wrote that Greenwood and Selway were "surely the most inventive rhythm section working close to the rock mainstream".

[21] In 2024, Far Out named him the third-most underrated bassist, describing him as a "master of rhythm of space" and citing his bassline for "How to Disappear Completely" as his best: "His style to a tee, the laid-back but focused walking groove underpins its profoundly dreamlike nature.

"[22] In 1997, Greenwood participated in a marketing campaign for his alma mater, Cambridge University, posing for a photo with students from both state and private schools for a poster titled "Put Yourself in the Picture".

The poster was "designed to break down some of the stereotypes that deter able students from applying to Cambridge" and encourage more applicants from state schools.

[23] Greenwood contributed bass to two soundtracks by his brother, Jonny, Bodysong (2003) and Inherent Vice,[24] and on his score for the 2008 film Woodpecker.

[29] He contributed beat programming to Yorke's song "Hearing Damage" from the soundtrack to The Twilight Saga: New Moon, and on "Guess Again!"