Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Star Wars : L'Ascension de Skywalker | 2019 | Emperor Palpatine |
| Actor | Star Wars - Episode III - La Revanche des Sith | 2005 | Supreme Chancellor Palpatine |
| Actor | Star Wars - Episode I - La Menace fantôme | 1999 | Senator Palpatine |
| Actor | Star Wars - Episode II - L'Attaque des clones | 2002 | Supreme Chancellor Palpatine |
| Actor | Star Wars - Episode VI - Le Retour du Jedi | 1983 | The Emperor |
| Actor | Utopia | Anton | |
| Actor | Sleepy Hollow : La Légende du cavalier sans tête | 1999 | Doctor Lancaster |
| Actor | Britannia | King Pellenor | |
| Actor | The Lost City of Z | 2017 | Sir George Goldie |
| Actor | Elizabeth I | Lord Burghley | |
| Actor | Le plus escroc des deux | 1988 | Arthur |
| Actor | 37 Days | Edward Grey | |
| Actor | Le Dragon du Lac de Feu | 1981 | Brother Jacopus |
| Actor | Rebecca | Coroner | |
| Actor | La Part du diable | ||
| Actor | Gorky Park | 1983 | Professor Andreev |
| Actor | Charles II: The Power and the Passion | Sir Edward Hyde | |
| Actor | Le Don du Roi | 1995 | Ambrose |
| Actor | Star Wars: Greatest Moments | 2015 | Himself |
| Actor | Les nouvelles aventures d'Annie | 1995 | Dr. Eli Eon |
| Actor | Star Wars: Evolution of the Lightsaber Duel | 2015 | Himself |
| Actor | Sleepy Hollow: Behind the Legend | 2000 | Ian McDiarmid |
| Actor | City of Vice | Henry Fielding | |
| Actor | Star Wars: A Musical Journey | 2005 | Host |
| Actor | Crime and Punishment | 2002 | Porfiry |
| Actor | La Malédiction de la vallée des rois | 1980 | Dr. Richter |
| Actor | Tchernobyl,Le Danger Final | 1991 | Dr. Vatisenko |
| Actor | How to Watch Star Wars, Part One: The Prequels Are Better Movies Than You Deserve | 2019 | Self (archive footage) |
| Actor | A Performance of Macbeth | 1979 | The Porter / Ross |