"Underdog" is the third single released from the album West Ryder Pauper Lunatic Asylum by English band Kasabian. It only peaked at #32 in the UK Singles Chart on the week after the album's release. Despite this it became a widely popular song.

"Underdog" was used in the credits of the 2010 film Takers. Snooker player Mark Selby has used "Underdog" as his walk-on music. Underdog is currently used as the run out music by English League One football teams Colchester United and Peterborough United, until Dave Robertson took over in February 2015, with the first match without "Underdog" being played a 2-0 win over Bradford City. Underdog has also been featured in the 2009 racing simulator Need for Speed: Shift. The music also featured in the Carlsberg England team talk advertisement for the 2010 World Cup, as did the band themselves. During the 2011 Rugby League Four Nations, an instrumental version of the song was used as music during video referee decisions. The song was played during the fourth episode of the first series of the BBC Three sitcom Mongrels. The song, like many other Kasabian tracks, is also used in at least one episode of BBC Two's Top Gear. It was also used on a highlight video for the 2009 European Grand Prix on the official Formula 1 website.

The song was also featured on an episode of The World's Strictest Parents in Australia. "Underdog" has been used by Sony in a commercial for their BRAVIA Televisions. The advert also features Real Madrid and Brazilian football player Kaká while he was with his former team AC Milan wearing their home kit.

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