Roger Ashton-Griffiths (born 19 January 1957) is an English character actor, screenwriter and film director.

Born in Hertfordshire, Ashton-Griffiths attended Altrincham Grammar School for Boys in Manchester.

He has appeared in numerous high-profile films, including Terry Gilliam's Brazil (1985) and The Brothers Grimm (2005), Dreamchild (1985), Young Sherlock Holmes (1985), Gene Wilder's Haunted Honeymoon (1986), Roman Polanski's Pirates (1986), Peter Greenaway's The Cook, the Thief, His Wife & Her Lover (1989), Mountains of the Moon (1990), Chicago Joe and the Showgirl (1990), Shadowlands (1993), The Portrait of a Lady (1996), The Wind in the Willows (1996), A Knight's Tale (2001), Martin Scorsese's Gangs of New York (2002), Woody Allen's You Will Meet a Tall Dark Stranger (2010), Olivier Dahan's Grace of Monaco (2014) and Mike Leigh's Mr. Turner (2014).

He has also worked extensively in television, including Jack the Ripper, The Odyssey, Merlin, Margaret, The Tudors, Doctor Who, Coronation Street and Father Brown.

Ashton-Griffiths is married to Sharmini Thillaimuthu, a senior studio director at the BBC, with whom he has two children.