Gareth Thomas (born 12 February 1945 - 13 April 2016) was a Welsh actor best known for portraying Roj Blake in the dystopian sci-fi series Blake's 7. He also had a recurring role in London's Burning as ACO William Bulstrode from 1989 to 1994.

His other work includes appearances in Z-Cars, Special Branch, Public Eye, Star Maidens, Blake's 7, Who Pays the Ferryman?, Bergerac, Heartbeat, By the Sword Divided, The Citadel, How Green Was My Valley, Knights of God, Coronation Street, The Avengers, Boon, Casualty, Taggart, Sherlock Holmes, Sutherland's Law, Torchwood and Midsomer Murders.