Alfie Evan Allen (born 12 September 1986) is an English actor. He is best known for playing Theon Greyjoy in the HBO series Game of Thrones (2011-2019). 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 ...