Reg Thomason (1918-2003) was a British actor, with a long resume of uncredited acting roles.
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- 1972 - Endless Night as Doctor in Rembrandt Painting Mock-up (uncredited)
- 1982 - Witness for the Prosecution as Barrister (uncredited)
- 1991 - Agatha Christie's Poirot, The Plymouth Express as Doorman (uncredited)
- 1991 - Agatha Christie's Poirot, The Mystery of the Spanish Chest as Military Club Member (uncredited)
- 1993 - Agatha Christie's Poirot, The Chocolate Box as Wine Drinker (uncredited)
- 1993 - Agatha Christie's Poirot, The Jewel Robbery at the Grand Metropolitan as Theatre Audience (uncredited)