Asa Maxwell Thornton Farr Butterfield (/ˈeɪsə/; born 1 April 1997) is a British actor. He gained notability for his role as the main character in the tragedy film The Boy in the Striped Pyjamas (2008), which earned him nominations for a number of accolades, including a London Film Critics Circle Award. For his leading performance in the drama film Hugo (2011), Butterfield was nominated for the Critics' Choice Movie Award for Best Young Performer and the Empire Award for Best Male Newcomer, among other accolades. He appeared in Morgan Matthews's X+Y (2014) which earned him a nomination for the British Independent Film Award for Best Actor, and stars in the Netflix comedy-drama series Sex Education (2019–present).
Butterfield was born in Islington, London, and is the son of Jacqueline Farr, a psychologist, and Sam Butterfield, an advertising copywriter.