Simon Phillip Hugh Callow, CBE (born 15 June 1949) is an English actor, writer and theatre director.

Callow was born in Streatham, London, UK, to Yvonne Mary Guise and Neil Francis Callow. He attended the London Oratory School.

Callow is one of the most prominent gay actors in Britain. For a while Callow lived with director Daniel Kramer.