"Diamond Hoo Ha Man" is a song by British rock band Supergrass. The single was first played live at Guilfest 2007 in Guildford, England, and this live version was then released as a free download via the band's website. It is the first official single from the band's sixth album, Diamond Hoo Ha, and was released on 14 January 2008 as a vinyl-only single, limited to 1,500 copies, thus limiting its chances of charting, which it failed to do. An instrumental version of the song was recorded by Biff Hyman for the Duke Diamond and Friends: Glange Fever Motion Picture Soundtrack.

Diamond Hoo Ha is the sixth and final studio album by British alternative rock band Supergrass, released in the UK on 24 March 2008, and offers a return to punchier Supergrass songs, in comparison to the more mellow Road to Rouen, their previous album released in 2005. Several songs appearing on the album were performed at Guilfest 2007. In November 2007, the track "Diamond Hoo Ha Man"—one of the songs debuted at Guilfest—was distributed as the first single on a limited vinyl release, restricted to 1500 copies. "Bad Blood" followed as the second single on 17 March 2008, peaking in the top 75 at number 73.