Louis William Tomlinson (; born Louis Troy Austin; 24 December 1991) is an English singer and songwriter. He rose to fame as a member of the boy band One Direction. Tomlinson auditioned for British singing competition The X Factor as a solo artist in 2010, but was eliminated. However, he and four other rejected solo contestants would later be placed into a group which would become British-Irish band One Direction, one of the best-selling boy bands of all time.

Following the group's hiatus in 2016, Tomlinson released "Just Hold On" with Steve Aoki as a debut solo single in December 2016. It peaked at number two on the UK Singles Chart and was certified platinum in the UK. In 2017, he released "Back to You" with American singer Bebe Rexha and "Miss You". That same year, he appeared on Debrett's 2017 list of the most influential people in the UK. In 2018, he appeared on the fifteenth series of The X Factor as a judge and a mentor of the "Boys" category.

In 2019, Tomlinson released the singles "Two of Us", "Kill My Mind", "We Made It", "Don't Let It Break Your Heart" and "Walls". His debut solo studio album, Walls, was released in January 2020, where it debuted at No. 4 in the UK and No. 9 in the US Billboard 200. Tomlinson's second studio album, Faith in the Future, was released in November 2022, where it debuted at No. 1 in the UK and No. 5 in the US Billboard 200.