Peter Macintosh Firth 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.

Sir Henry James "Harry" Pearce, KBE is a fictional character, head of the counter-terrorism department of MI5 as featured in the British television series Spooks. He was played by Peter Firth during the whole run of the series from 2002 to 2011, and reprised for the 2015 film, Spooks: The Greater Good.