Liam Carroll was born in Manhattan Beach, California after his grandparents immigrated to the United States from Ireland. He currently resides there with his parents Siobhan and Timothy Carroll and younger siblings, sister Norah and brother Ronan.

Liam Carroll began performing on stage at Family Theater Inc., Hermosa Beach when he was 10 years old. His television career began in 2014 with a guest star role on The Neighbors before landing his series regular role as Jared on the TBS hit series The Detour.