Griffiths' movie roles were in: "Gorky Park" (1983), "Withnail and I" (1987), "King Ralph" (1991), "" (1991), "Guarding Tess" (1994) and "Sleepy Hollow" (1999). Later, he played Harry Potter's cruel uncle Vernon Dursley in the "Harry Potter movie series" ("the Philosopher's Stone", "the Chamber of Secrets", "the Prisoner of Azkaban", "the Order of the Phoenix", and "the Deathly Hallows - Part 1".)