Thomas Alexander Walker (born 17 December 1991) is a Scottish singer-songwriter. He was trained at the stage school London College of Creative Media, and was given a contract soon after. He rose to fame after the release of his single "Leave a Light On", which peaked at number 7 on the UK Singles Chart in June 2018.

"Leave a Light On" was released to digital retailers on 13 October 2017. The song was co-written by Walker and Steve Mac. The song reached the top 10 in Austria, Wallonia, Germany, Italy and Switzerland, while reaching the top 40 in Australia, Flanders, France, Poland and the Netherlands. The song reached number 34 on the Irish Singles Chart.

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