Justin Chatwin (born October 31, 1982) is a Canadian actor, known for his roles in War of the Worlds (2005), The Invisible (2007), and Dragonball Evolution (2009).

Chatwin is also known for his work in the Showtime comedy-drama series Shameless. In 2016, he starred in the CBS mystery series American Gothic. He was also the principal guest-star in the 2016 Christmas special of the BBC1 series Doctor Who in "The Return of Doctor Mysterio".