Hannah John-Kamen (born 6 September 1989) is a British actress. She is known for her roles as Dutch in the Syfy television series Killjoys, Ornela in the HBO series Game of Thrones, F'Nale Zandor in Steven Spielberg's Ready Player One, and Ghost in the Marvel Cinematic Universe film Ant-Man and the Wasp.
John-Kamen was born in Anlaby, East Yorkshire, England, the youngest of three children of a Nigerian forensic psychologist father and a Norwegian former fashion model mother. She has an older brother and an older sister. She attended primary school in Kirk Ella and received her secondary education at Hull Collegiate School, and trained at the National Youth Theatre in London. In 2012, she graduated from the Central School of Speech and Drama.
John-Kamen began her career in 2011 when she provided her voice for the video game Dark Souls. She went on to make episode appearances in television series Misfits (2011), Black Mirror (2011), Whitechapel (2012), The Syndicate (2012), The Midnight Beast (2012) and The Hour (2012).