Jamie Metcalfe Campbell Bower (born 22 November 1988) is an English actor, model and singer. He made his feature film debut in 2007 with a supporting role in Tim Burton's Sweeney Todd: The Demon Barber of Fleet Street, before going on to feature in The Twilight Saga (2009–2012) and as the young Gellert Grindelwald in Harry Potter and the Deathly Hallows – Part 1 (2010) and Fantastic Beasts: The Crimes of Grindelwald (2018). Bower was part of the main cast of the fantasy series Camelot (2011, Starz) and Will (2017, TNT), both of which only ran for a single season each.

From 2015 to 2020, he served as the frontman of London-based band Counterfeit. In 2020, he began releasing music as a solo artist. In 2022, Bower joined the cast of the Netflix science fiction horror series Stranger Things, where he plays Henry Creel/Vecna in the fourth and fifth seasons, a role for which he has garnered wide critical acclaim. On 19 December 2025, he reprised the role onstage in his Broadway debut, a surprise appearance in the final scene of Stranger Things: The First Shadow.