Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Star Wars: Episode IX - Der Aufstieg Skywalkers | 2019 | Emperor Palpatine |
| Actor | Star Wars: Episode III - Die Rache der Sith | 2005 | Supreme Chancellor Palpatine |
| Actor | Star Wars: Episode I - Die dunkle Bedrohung | 1999 | Senator Palpatine |
| Actor | Star Wars: Episode II - Angriff der Klonkrieger | 2002 | Supreme Chancellor Palpatine |
| Actor | Star Wars: Episode VI – Die Rückkehr der Jedi-Ritter | 1983 | The Emperor |
| Actor | Utopia | Anton | |
| Actor | Sleepy Hollow | 1999 | Doctor Lancaster |
| Actor | Britannia | King Pellenor | |
| Actor | Die versunkene Stadt Z | 2017 | Sir George Goldie |
| Actor | Elisabeth I. | Lord Burghley | |
| Actor | Zwei hinreissend verdorbene Schurken | 1988 | Arthur |
| Actor | 37 Days | Edward Grey | |
| Actor | Der Drachentöter | 1981 | Brother Jacopus |
| Actor | Rebecca | Coroner | |
| Actor | Touching Evil | ||
| Actor | Gorky Park | 1983 | Professor Andreev |
| Actor | Charles II: The Power and the Passion | Sir Edward Hyde | |
| Actor | Restoration - Zeit der Sinnlichkeit | 1995 | Ambrose |
| Actor | Star Wars: Greatest Moments | 2015 | Himself |
| Actor | Annie - Ein königliches Abenteuer | 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 | Das Erwachen der Sphinx | 1980 | Dr. Richter |
| Actor | Chernobyl: The Final Warning | 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 |