"One Thing" is a song by English-Irish boy band One Direction from their debut studio album, Up All Night (2011). It was released in various countries by Syco Music on 6 January 2012, as their second single, and as their third single in the UK on 13 February 2012. Additionally, Columbia Records sent it to contemporary hit radio playlists on 22 May 2012 as their second single in the United States. Written by Savan Kotecha and its producers, Carl Falk and Rami Yacoub, initially, the upbeat pop rock number was written as two different songs. As both tracks had elusive attributes, the trio decided to merge the two into one song. The lyrical content regards the protagonist's infatuation with a significant other.

"One Thing" garnered mostly positive reviews from music critics, who generally commended the track's catchiness. The single reached the top ten in Australia, Ireland and the United Kingdom, while attaining top-forty positions in Belgium (Flanders), Canada, New Zealand, and the United States. The number has been certified platinum by the Recording Industry Association of America (RIAA) for shipments of one million copies. Directed by Declan Whitebloom, the accompanying music video depicts One Direction performing in and around London. The group performed "One Thing" on televised programmes and four major concert tours: Up All Night Tour (2011–12), Take Me Home Tour (2013), Where We Are Tour (2014) and On the Road Again Tour (2015). This song is the eleventh track on Now 43.

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