Biography
Jack Nielen is a British actor working in film and theatre. He made his feature film debut as Prince William in Pablo Larraín’s Spencer (2021), opposite Kristen Stewart as Princess Diana. The film premiered at the Venice Film Festival.
Trained in both the United States and the United Kingdom, Nielen has appeared in stage productions at Deerfield Academy, including Ralph Mayhew in Blue Stockings (2025) and Charlie Flynn in Dog Eat Dog (2026). He is based in London.
