Alfie Evan Allen (born 12 September 1986) is an English actor. He portrayed Theon Greyjoy on all eight seasons of the Home Box Office (HBO) fantasy TV 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.

Theon Greyjoy is a fictional character in the "A Song of Ice and Fire" series of fantasy novels by American author George R. R. Martin, and its television adaptation "Game of Thrones". Theon is the youngest son and heir of Balon Greyjoy, taken as a hostage by Lord Eddard Stark following Balon's failed rebellion. Theon's complex and often troubled relationship with both his family and his captors is central to the character's arc throughout the novels and its television adaptation.

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