"Harrowdown Hill" is a song by Radiohead frontman Thom Yorke and is the eighth track on his 2006 album The Eraser. The song was also released as a limited edition single in the United Kingdom on 21 August 2006, peaking at #23 in the UK Singles Chart (see 2006 in British music). "Harrowdown Hill" was Yorke's first solo single, and one of two to be released from The Eraser; however, the track "Black Swan" had already been issued as a radio-only single in some areas. The song was written about biological warfare expert David Kelly who, as a matter of some contention, committed suicide in 2003. However, there is speculation that he was murdered, as demonstrated in the song. Thom Yorke himself confirmed the song's meaning in several interviews.

A video for the song was released 31 July 2006 and had its first play on Channel 4.

Harrowdown Hill in Longworth, Oxfordshire is notable for being the place where the body of Dr. David Kelly was found in 2003. His evidence had raised questions about Saddam Hussein's possession of weapons of mass destruction — the official justification for the UK government's decision to invade Iraq. In an interview with The Globe and Mail, Yorke said, "The government and the Ministry of Defence... were directly responsible for outing him and that put him in a position of unbearable pressure that he couldn't deal with, and they knew they were doing it and what it would do to him... I've been feeling really uncomfortable about that song lately, because it was a personal tragedy, and Dr. Kelly has a family who are still grieving. But I also felt that not to write it would perhaps have been worse." In another interview, Yorke said that "Harrowdown Hill" is "the most angry song I've ever written in my life. I'm not gonna get into the background to it, the way I see it... And it's not for me or for any of us to dig any of this up. So it's a bit of an uncomfortable thing." Yorke also notes that "'Harrowdown Hill' was kicking around during Hail to the Thief, but there was no way that was going to work with the band.".

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