James Metcalfe Campbell Bower (born 22 November 1988) is an English actor, singer, and model. He is best known for his roles as Anthony Hope in Sweeney Todd: The Demon Barber of Fleet Street, Caius in The Twilight Saga, King Arthur in the Starz series Camelot, the young Gellert Grindelwald in Harry Potter and the Deathly Hallows – Part 1, Jace Wayland in The Mortal Instruments: City of Bones and playwright Kit Marlowe in the short-lived series Will.

Jamie is also the lead vocalist, guitarist and founding member of Counterfeit, a band formed in 2015 in London, UK.