Mawle is best known for his roles as Jesus Christ in The Passion (2008), Benjen Stark in Game of Thrones (2011–2017), Pete in Shell (2012), Firebrace in Birdsong (2012), Thomas Lincoln in Abraham Lincoln: Vampire Hunter (2012), Detective Inspector Jedediah Shine in Ripper Street (2013-2016), Odysseus in Troy: Fall of a City (2018), and Adar in Season one of The Lord of the Rings: The Rings of Power (2022).

Mawle left the school at 16 to become an actor but contracted labyrinthitis, leaving him 70 per cent hearing-impaired in the upper register and with tinnitus.

He persuaded the director of the local college at Stratford-upon-Avon to let him study for a BTEC in performing arts while doing an assortment of jobs such as fitness instructor and dishwasher.

It was his performance in the television film Soundproof (2006), wherein a deaf actor was needed for the lead role, that made his biggest impact.

[5] In 2010, Mawle featured in artist David Austen's End of Love and in the short film Sometimes The Moon Is Velvet, which toured festivals.

He also appeared in Agatha Christie's Murder on the Orient Express, the BBC drama Five Daughters, Dominic Savage's Dive, and Made in Dagenham starring Sally Hawkins.

[6] Also in 2011, he was featured in The Horrible Crowes' music video for their debut single "Behold the Hurricane"[7][8] and joined the HBO series Game of Thrones as Benjen Stark.