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, the young Gellert Grindelwald in Harry Potter and the Deathly Hallows – Part 1 and Fantastic Beasts: The Crimes of Grindelwald, Jace Wayland in The Mortal Instruments: City of Bones and playwright Kit Marlowe in the short-lived series Will.
Bower is also the lead vocalist, guitarist and founding member of Counterfeit, a band formed in 2015 in London.
Bower was born in London. His mother, Anne Elizabeth (née Roseberry), is a music manager, and his father, David Bower, works for the Gibson Guitar Corporation. His maternal great-great-great-great-grandfather was Sir John Campbell, of Airds, Lieutenant Governor of Saint Vincent and the Grenadines. He attended Bedales School, a co-educational independent school in Hampshire, and is a former member of the National Youth Music Theatre and the National Youth Theatre.