William Thomas
 | La Cha Cha (2021) Pat |
 | Concrete Plans (2020) Dave |
 | Bittersweet Symphony (2019) Dr. Kirkby |
 | Wild Honey Pie! (2018) David Walker |
 | Which Way Is Ireland? (2015) Taid |
 | Just Jim (2015) Sammy |
 | Y Syrcas (2013) |
 | Mr. Nice (2010) Dennis Marks |
 | Freebird (2008) Welsh Farmer |
 | The Baker (2007) Alun Thomas |
 | January 2nd (2006) Tom |
| | Y Mabinogi (2003) Hefeydd (voice) |
 | House! (2000) Clipboard |
 | The Miracle Maker (2000) Magi (voice) |
 | Longitude (2000) Arthur Mason |
 | Solomon and Gaenor (1999) Idris Rees |
 | Catfish in Black Bean Sauce (1999) Douglas |
 | Twin Town (1997) Bryn Cartwright |
 | Darklands (1996) Detective Jarvis |
 | Dafydd (1995) David Davies |
 | Sticky Wickets (1990) Cyril |
 | Doctor Who: Remembrance of the Daleks (1988) Martin |
| | Reasonable Force (1988) The Sportsman |
 | The Life and Times of David Lloyd George (1981) William George |
| | Newid Gêr (1979) John Lloyd / Keith Lloyd |
 | Dylan: The Life and Death of a Poet (1978) Idris |
 | Casey's Shadow (1978) Jockey |
 | Antony and Cleopatra (1975) Soldier |
 | Buddha Boy Grandad |