"Us Against the World" is a song by Irish boy band Westlife from their ninth studio album, Back Home (2008). The song was released as the album's second single on 3 March 2008.

The song was written by Arnthor Birgisson, Rami Yacoub and Savan Kotecha. A music video for the song was filmed in December 2007 and premiered on 14 February 2008.

The song was composed by Arnthor Birgisson, Rami Yacoub and Savan Kotecha, who also co-wrote numerous tracks on the Back Home album, namely "Something Right", "The Easy Way", and "Pictures in My Head". The single was officially confirmed by band member Nicky Byrne during an X Factor interview, which later appeared on the band's official website. "Us Against the World" was also dedicated to Westlife's fans worldwide to mark their continuous support. The band gave their first live performance of "Us Against The World" on the TV special "The Westlife Show - Live", which was broadcast on December 15, 2007. In the Philippines, both the song and music video premiered on 3 July 2008, the band's anniversary date.

Digital Spy's Alex Fletcher rated the album and said: "Westlife have claimed that 'Us Against The World' is the best track on their recent Back Home album, so, if nothing else, we should be grateful that the record company chose to release this rather than one of the tracks the soppy Irish warblers weren't as impressed with."

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