Stephen John Thorne (2 March 1935 – 26 May 2019) was a British actor of radio, film, stage, and television. He was best known for his regular BBC Radio 4 work and audiobook recordings, and for his portrayals of a few Doctor Who villains, including the Time Lord Omega.

He played several seasons with the Old Vic Company and the Royal Shakespeare Company in Stratford and London, including a tour to Russia. He worked extensively in radio with over 2000 broadcasts for the BBC, including as Uncle Mort in the Radio 4 comedy series Uncle Mort's North Country. His television credits included Z-Cars, Crossroads, and Doctor Who.