Liam Garrigan (born 1981) is an English actor. As a youth, he attended classes at Kingston upon Hull's Northern Theatre Company and was a student at Wyke College, Kingston upon Hull. His first television role was in 2003 as Nic Yorke in the BBC continuing drama series Holby City. He is best known for his roles as Ian Al-Harazi on the Fox series 24: Live Another Day (2014), as King Arthur in the ABC series Once Upon a Time (2015–2016), the film Transformers: The Last Knight (2017), and as Thomas Jopson on AMC's The Terror (2018). He also provides the voice for Captain Kurt in the role-playing game GreedFall.