Alfie Evan Allen (born 12 September 1986) is an English actor. He portrayed Theon Greyjoy on all eight seasons of the HBO fantasy series Game of Thrones (2011–2019), for which he received a nomination for the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series in 2019. In film, he is best known for his starring roles in John Wick (2014), The Predator (2018), and Jojo Rabbit (2019).

Early life and education
Allen was born on 12 September 1986 in Hammersmith, London, the son of film producer Alison Owen and actor Keith Allen. His older sister is singer Lily Allen; her song "Alfie" is about him. His uncle is actor Kevin Allen. He is a third cousin of singer Sam Smith. He attended Windlesham House School in Sussex, Embley Park School near Romsey, St John's College in Portsmouth, and the Fine Arts College in Hampstead, where he studied for his A-levels.