Guitarist and lead vocalist for the Australian rock band 5 Seconds of Summer. The other 3 members of the band are Michael Clifford, Calum Hood, and Ashton Irwin.
He started uploading YouTube videos of himself singing in 2011.
In 2012, he released the EPs Unplugged and Somewhere New with 5 Seconds of Summer. In 2014, his band won an American Music Award for New Artist of the Year.
He grew up with two brothers: Ben and Jack. His parents are named Andrew and Liz. He began dating Instagram star Arzaylea.
Louis Tomlinson promoted the 5 Seconds of Summer song "Gotta Get Out" in 2012, which helped the band gain popularity.