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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 2000 | Cor, Blimey! | Man in Audience | ★★★☆☆ |
| 1997 | Mrs. Dalloway | Reggie | ★★★☆☆ |
| 1997 | Bean, lo último en cine catastrófico | National Art Gallery Board Member (uncredited) | ★★★☆☆ |
| 1986 | La loca guerra de la Gran Bretaña | Royal Servant (uncredited) | ★★★☆☆ |
| 1980 | El hombre elefante | Lecture Assistant (uncredited) | ★★★★☆ |
| 1980 | El resplandor | Ballroom Guest (uncredited) | ★★★★☆ |
| 1980 | S.O.S. Titanic | Passenger on Staircase (uncredited) | ★★★☆☆ |
| 1977 | Secret Army | Scientist | ★★★★☆ |
| 1975 | The Good Life | Man In Pub | ★★★★☆ |
| 1974 | Mansión sangrienta | Hollywood Party Guest (uncredited) | ★★★☆☆ |
| 1973 | Hitler: los diez últimos días | German Officer | ★★★☆☆ |
| 1973 | Carry On Girls | Town Councillor (uncredited) | ★★★☆☆ |
| 1972 | Noche sin fin | Doctor in Rembrandt Painting Mock-up (uncredited) | ★★★☆☆ |
| 1971 | Percy | Doctor | ★★☆☆☆ |
| 1971 | Pánico en el bosque | Man in Police Station (uncredited) | ★★★☆☆ |
| 1971 | Clinic Exclusive | Hotel Clerk | ★★☆☆☆ |
| 1970 | The Reckoning | Party Guest | ★★★★☆ |
| 1969 | El ataúd (La caja oblonga) | Drunk (uncredited) | ★★★☆☆ |
| 1969 | Su vida íntima | Party Guest (uncredited) | ★★★☆☆ |
| 1968 | Chitty Chitty Bang Bang | Castle Guest (uncredited) | ★★★☆☆ |
| 1967 | El circo del crimen | Reporter (Uncredited) | ★★★☆☆ |
| 1966 | Fahrenheit 451 | Train Passenger (uncredited) | ★★★★☆ |
| 1966 | Doctor in Clover | Hospital Porter (Uncredited) | ★★★☆☆ |
| 1965 | Atraco imperfecto | Member of Police Choir | ★★★☆☆ |
| 1964 | Rattle of a Simple Man | Pub Customer (uncredited) | ★★☆☆☆ |
| 1964 | El Rolls Royce amarillo | Florence Restaurant Patron (uncredited) | ★★★☆☆ |
| 1961 | Raising the Wind | Man in Pub (uncredited) | ★★★☆☆ |
| 1961 | The Breaking Point | Casino Patron (uncredited) | ★★★☆☆ |
| 1960 | Hell Is a City | Barman (uncredited) | ★★★☆☆ |
| 1960 | Circo de los horrores | Roustabout (uncredited) | ★★★☆☆ |
| 1960 | There Was a Crooked Man | Town Hall Meeting Audience | ★★★☆☆ |
| 1960 | Beat Girl | Man Outside Strip Club (uncredited) | ★★★☆☆ |
| 1959 | Expresso Bongo | Jukebox Delivery Man | ★★★☆☆ |
| 1959 | Please Turn Over | Office Worker (uncredited) | ★★★☆☆ |
| 1959 | La noche es mi enemiga | Barrister (uncredited) | ★★★★☆ |
| 1959 | Un lugar en la cumbre | Man Backstage (uncredited) | ★★★☆☆ |
| 1958 | La Llave | Soldier at Dance (uncredited) | ★★★☆☆ |
| 1957 | El único evadido | German Prisoner of War | ★★★★☆ |
| 1951 | Encore | Casino Patron (uncredited) | ★★★☆☆ |
| 1948 | Snowbound | ★★★☆☆ | |
| 1948 | London Belongs to Me | Bystander (uncredited) | ★★★☆☆ |
Películas destacadas de Reg Thomason
Estas son las películas más destacadas en las que ha trabajdo:
