Alfie Evan James Allen (born 12 September 1986) is an English actor. He is best known for portraying Theon Greyjoy in the HBO series Game of Thrones since 2011.
Allen was born in Hammersmith, London, the son of film producer Alison Owen and Welsh-born actor Keith Allen. His older sister is singer Lily Allen; her song "Alfie" is about him. He went to 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. He is also a third cousin of British singer Sam Smith.