Joseph William Locke (born 24 September 2003) is a Manx and British actor. He is known for his lead role as high school student Charlie Spring in the Netflix teen series Heartstopper (2022–2024) and its series finale film Heartstopper Forever(2026), for which he received two Children's and Family Emmy Award nominations for Outstanding Lead Performance, winning on his second nomination in 2025. 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.