Ruby (Kaiser Chiefs song)

"Ruby" is a song by English indie rock band Kaiser Chiefs. It was released in the United States on 29 January 2007 and the United Kingdom on 5 February as the lead single from their second studio album, Yours Truly, Angry Mob (2007). It became the band's first British number-one single on 25 February 2007 and ended 2007 as the year's 10th-biggest-selling single in the UK, with total sales of 313,765. As of July 2026, it has sold over 1,800,000 copies in the UK as stated by the British Phonographic Industry (BPI). In the US, it charted at number seven the BillboardTriple A chart, becoming the band's highest-charting hit in the US. "Ruby" was voted number 13 on the Triple J Hottest 100 of 2007, Australia's largest annual music poll.

A video single of the song was released in the US at Best Buy stores on 13 March 2007, two weeks before the album was released there, and featured a live version of "Everything Is Average Nowadays" and the B-side "Admire You" (released on the UK 7-inch version).