"Us Against the World" is a song by Irish boy band Westlife from their eighth studio album Back Home (2007).

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".

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.

[5] The initial video, which featured both the lads and their loved ones, was shot at the Twickenham Stadium in London over a two-day span.