William Duffy is an actor.
Oyuncu
| 2020 | A West Wing Special to Benefit When We All Vote as Larry |
| 2010 | The Ascent as Thomas Shaw |
| 2006 | Ölümüne as Newscaster #2 |
| 2006 | Karla as Detective Porter |
| 2004 | Keskin Nişancı 3 as Richard Addis |
| 1999 | Geçmişin Sığınağı as Workman #1 |
| 1997 | Double Tap as Gas Man |
| 1994 | Betrayed by Love as Paxton |
| 1990 | Dedektif Jake as Desk Sergeant |
| 1970 | Loving as Jay |
| 1965 | Brainstorm as Orderly (uncredited) |
Diğer Roller
| 1977 | Death Game - Executive Producer |
Duvar