| 2015 | Best of Enemies | Self | ★ 7.2 |
| 2013 | Salinger | Self - Writer | ★ 6.3 |
| 2013 | Gore Vidal: The United States of Amnesia | Self | ★ 7.8 |
| 2013 | Valentino's Ghost | Self | ★ 5.7 |
| 2013 | Paul Bowles: The Cage Door Is Always Open | Self | ★ 5.0 |
| 2012 | Norman Mailer: The American | Self | ★ 7.0 |
| 2011 | The Strange History of Don't Ask, Don't Tell | Self | ★ 6.3 |
| 2010 | Public Speaking | Self (archive footage) | ★ 7.0 |
| 2010 | Standing Army - Die geheime Strategie der US-Militärbasen | Self | ★ 4.8 |
| 2009 | Shrink - Nur nicht die Nerven verlieren | George Charles | ★ 6.1 |
| 2008 | Obscene: A Portrait of Barney Rosset and Grove Press | Self | ★ 5.0 |
| 2008 | Zero: An Investigation Into 9/11 | Self | ★ 6.1 |
| 2006 | Die Akte USA gegen John Lennon | Self | ★ 6.6 |
| 2006 | Global Haywire | Self | ★ 0.0 |
| 2005 | Revisiting Brideshead | Self | ★ 0.0 |
| 2005 | One Bright Shining Moment | Self | ★ 6.5 |
| 2005 | Trailer for a Remake of Gore Vidal's Caligula | Self | ★ 6.1 |
| 2005 | Middle Sexes: Redefining He and She | Narrator (Voice) | ★ 3.5 |
| 2005 | Inside Deep Throat | Self | ★ 6.4 |
| 2005 | Why we fight – Die guten Kriege der USA | Self - Author, "Imperial America" | ★ 7.5 |
| 2005 | High Tech Lincoln | Self | ★ 0.0 |
| 2004 | Thinking XXX | Self | ★ 5.5 |
| 2003 | The Education of Gore Vidal | Self | ★ 6.0 |
| 2003 | Federico Fellini - Mit den Augen der Anderen | Self | ★ 0.0 |
| 2002 | Igby! | First School Headmaster (uncredited) | ★ 6.6 |
| 2002 | The Cockettes | Self (archive footage) | ★ 6.7 |
| 2001 | Rescued from the Closet | Self | ★ 6.0 |
| 1997 | Gattaca | Director Josef | ★ 7.6 |
| 1997 | Die Verschwörung im Schatten | Page | ★ 5.0 |
| 1996 | Gefangen in der Traumfabrik | Self | ★ 7.2 |
| 1994 | Tennessee Williams: Orpheus of the American Stage | Self | ★ 0.0 |
| 1994 | In Search of Oz | Self | ★ 0.0 |
| 1994 | Ein genialer Freak | Prof. Pitkannan | ★ 6.7 |
| 1993 | Ben-Hur: The Making of an Epic | Self - Author | ★ 7.4 |
| 1993 | The Great Depression: A Job at Ford's | Self | ★ 0.0 |
| 1992 | Bob Roberts | Senator Brickley Paiste | ★ 6.5 |
| 1989 | Gejagt bis in den Tod | Preacher (uncredited) | ★ 6.9 |
| 1984 | Gore Vidal: The Man Who Said No | Self | ★ 0.0 |
| 1981 | A Documentary on the Making of 'Gore Vidal's Caligula' | Self - Writer | ★ 2.0 |
| 1972 | Fellinis Roma | Gore Vidal (uncredited) | ★ 7.2 |
| 1967 | The Homosexuals | Self | ★ 1.0 |
| 1964 | Der Kandidat | Delegate (uncredited) | ★ 7.3 |
| 1959 | Plötzlich im letzten Sommer | Audience Member at Operation (uncredited) | ★ 7.3 |
| 1946 | Ritual in Transfigured Time | Man (uncredited) | ★ 6.9 |
| 1936 | Ten Year Old Boy Pilot | Himself | ★ 0.0 |
