Peter Macintosh Firth (born 27 October 1953) is an English actor. He is best known for his role as Sir Harry Pearce in the BBC One programme Spooks; he is the only actor to have appeared in every episode of the programme's ten-series lifespan. He has given many other television and film performances, most notably as Alan Strang in Equus (1977), earning both a Golden Globe Award and an Academy Award nomination for the role.

Early life, family and education
Firth was born in Bradford, West Riding of Yorkshire, England, the son of publicans Mavis (née Hudson) and Eric Macintosh Firth. He attended Hanson School in Bradford.