Joseph William Locke is a Manx actor. He is known for his lead role as high school student Charlie Spring in the Netflix teen series Heartstopper (2022–present), for which he received a nomination for the inaugural Children's and Family Emmy Award for Outstanding Lead Performance. In 2024, he starred as Billy Maximoff / William Kaplan in the Marvel Cinematic Universe miniseries Agatha All Along and as Tobias Ragg in a Broadway revival of the musical Sweeney Todd: The Demon Barber of Fleet Street.