"Say You Won't Let Go" is a song by British singer and songwriter James Arthur. The song was released as a digital download on 9 September 2016 in the United Kingdom by Columbia Records as the lead single from his second studio album Back from the Edge (2016). The single peaked at the top of the UK Singles Chart, a position it maintained for three weeks. Outside the United Kingdom, the single has topped the charts in Australia, New Zealand, Sweden and the Republic of Ireland. It also became his first hit in the US, peaking at number 13 on the Billboard Hot 100.

A music video to accompany the release of "Say You Won't Let Go" was first released onto YouTube on 9 September 2016 at a total length of three minutes and thirty seconds.

On 12 September 2016, the song was at number 30 on The Official Chart Update in the United Kingdom. On 15 September 2016, the song entered the Irish Singles Chart at number 91 before peaking at number one on 14 October and spending four non-consecutive weeks at the top of the charts. On 16 September 2016, the song entered the UK Singles Chart at number 25, and peaked at number one two weeks later, spending three consecutive weeks at the top. The song has also charted in Australia, France, New Zealand and Sweden.

It is also his first single to chart on the US Billboard Hot 100, making Arthur only the second winner of The X Factor UK to reach the US top 40 (following Leona Lewis) and only the third winner to chart on the Hot 100 following Lewis and Little Mix. The song was ranked the nineteenth biggest-selling song of 2016 in the UK, making Arthur the biggest-selling British male artist of the year. By the second week of January 2017, it had surpassed the one million sales mark, making him the first-ever X Factor act to have two singles sell over a million copies in his homeland. On February 26, 2017, it was announced on Channel 4's Sunday Brunch that the single had sold 2 million copies worldwide. In early March, it had gone double platinum in the UK and platinum in the US.

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