| Movie | 1971 | A Clockwork Orange | Alex | |
| Movie | 1994 | Star Trek: Generations | Dr. Tolian Soran | |
| Movie | 2007 | Halloween | Dr. Samuel Loomis | |
| Movie | 2013 | The Anatomy of a Virus: The Making of Antiviral | Himself | |
| Movie | 2003 | I'll Sleep When I'm Dead | Boad | |
| Movie | 2002 | Shadow Realm | Martin Hudson | |
| Movie | 2000 | Gangster No. 1 | Gangster 55 | |
| Movie | 1992 | The Player | Malcolm McDowell | |
| Movie | 1990 | Moon 44 | Major Lee | |
| Movie | 2001 | The Void | Dr. Thomas Abernathy | |
| Movie | 2010 | The Book of Eli | Lombardi | |
| Movie | 2008 | Delgo | Raius (voice) | |
| Movie | 2001 | Princess of Thieves | Sheriff of Nottingham | |
| Movie | 2009 | Halloween II | Dr. Samuel Loomis | |
| Movie | 1982 | Cat People | Paul Gallier | |
| Movie | 1990 | Class of 1999 | Dr. Miles Langford | |
| Movie | 1983 | Blue Thunder | Cochrane | |
| Movie | 1979 | Time After Time | H. G. Wells | |
| Movie | 2002 | I Spy | Gundars | |
| Movie | 2008 | Coco Chanel | Marc Bouchier | |
| Movie | 2021 | A Forbidden Orange | Narrator (voice) / Alex DeLarge | |
| Movie | 1998 | Day of the Full Moon | | |
| Movie | 1995 | Cyborg 3: The Recycler | Lord Talon | |
| Movie | 1997 | Hugo Pool | Henry Dugay | |
| Movie | 1995 | Fist of the North Star | Ryuken | |
| Movie | 1979 | Caligula | Caligula | |
| Movie | 1995 | Tank Girl | Kesslee | |
| Movie | 1982 | Britannia Hospital | Mick Travis | |
| Movie | 2008 | Bolt | Dr. Calico (voice) | |
| Movie | 2008 | Doomsday | Dr. Marcus Kane | |
| Movie | 2005 | Dinotopia: Quest for the Ruby Sunstone | Ogthar (voice) | |
| Movie | 1983 | Get Crazy | Reggie Wanker | |
| Movie | N/A | Robot Dracula | Robot Dracula | |
| Movie | 1973 | O Lucky Man! | Michael Arnold Travis / Plantation Thief | |
| Movie | 2007 | The List | Desmond Larochette | |
| Movie | 2010 | The Invocation | Self | |
| Movie | 1968 | if.... | Mick Travis | |
| Movie | 2007 | Robot Chicken: Star Wars | Orientation Instructor (voice) | |
| Movie | 2003 | Dorian | Henry | |
| Movie | 2012 | Silent Hill: Revelation 3D | Leonard Wolf | |
| Movie | 2006 | The Curse of King Tut's Tomb | Nathan Cairns | |
| Movie | 2021 | Dreaming of Stars: An ASMR Feature Film | Self (voice) | |
| Movie | 2010 | Easy A | Principal Gibbons | |
| Movie | 2010 | Barry Munday | Mr. Farley | |
| Movie | 2010 | Tom and Jerry Meet Sherlock Holmes | Professor Moriarity (voice) | |
| Movie | 1976 | Aces High | Maj. John Gresham | |
| Movie | 2009 | Suck | Eddie Van Helsing | |
| Movie | 1989 | Happily Ever After | Lord Malice (voice) | |
| Movie | 1988 | Sunset | Alfie Alperin | |
| Movie | 2009 | Super Rhino | Dr. Calico (voice) | |
| Movie | 2002 | Between Strangers | Alan Baxter | |
| Movie | 2004 | Evilenko | Andrej Romanovic | |
| Movie | 2016 | Because I Am a Genius! Lorenza Mazzetti | Himself | |
| Movie | 1999 | Y2K | Seward | |
| Movie | 2010 | DC Showcase: Green Arrow | Merlyn the Magnificent (voice) | |
| Movie | 1998 | Nazis: The Occult Conspiracy | Narrator (voice) | |
| Movie | 1999 | My Life So Far | Uncle Morris MacIntosh | |
| Movie | 2003 | Tempo | Shrenger | |
| Movie | 2002 | The Barber | Dexter Miles | |
| Movie | 2005 | Billy and Mandy Save Christmas | Baron Von Ghoulish (voice) | |
| Movie | 1979 | The Passage | Capt. Von Berkow | |
| Movie | 2015 | Cowboys & Engines | Dr. Clay | |
| Movie | 2006 | Cut Off | James Burton | |
| Movie | 2011 | Pound of Flesh | Professor Noah Melville | |
| Movie | 2003 | The Company | Alberto Antonelli | |
| Movie | 2011 | Suing The Devil | Satan | |
| Movie | 2002 | The Fairy King | Ian | |
| Movie | 1975 | Royal Flash | Captain Harry Flashman / Prince Karl Magnus | |
| Movie | 1990 | Jezebel's Kiss | Benjamin J. Faberson | |
| Movie | 2012 | Vamps | Vlad Tepish | |
| Movie | 1998 | The First 9½ Weeks | Francois Dubois | |
| Movie | 2011 | The Artist | The Butler | |
| Movie | 2012 | Excision | Mr. Cooper | |
| Movie | 1976 | Voyage of the Damned | Max Gunter | |
| Movie | 2001 | Just Visiting | Wizard | |
| Movie | 2022 | Father Stu | Monsignor Kelly | |
| Movie | 1993 | Bopha! | De Villiers | |
| Movie | 1996 | Night Train to Venice | Stranger | |
| Movie | 2004 | Tempesta | Paul Valenzin | |
| Movie | 2023 | Metalocalypse: Army of the Doomstar | Vader Orlag (voice) | |
| Movie | 2010 | What If Cannabis Cured Cancer | himself | |
| Movie | 2003 | Inhabited | Dr. Werner | |
| Movie | 2011 | Golf in the Kingdom | Julian Lange | |
| Movie | 2005 | Rag Tale | Richard Morton | |
| Movie | 2017 | Heroes Manufactured | Self (archive footage) | |
| Movie | 1992 | Chain of Desire | Hubert Bailey | |
| Movie | 2011 | L.A., I Hate You | Harold Weintraub | |
| Movie | 1989 | Buy & Cell | Warden Tennant | |
| Movie | 2012 | The Philadelphia Experiment | Morton Salinger | |
| Movie | 1970 | Figures in a Landscape | Ansell | |
| Movie | 1994 | The Man Who Wouldn't Die | Bernard Drake / Ian Morrissey | |
| Movie | 2012 | Antiviral | Dr. Abendroth | |
| Movie | 1995 | Kids of the Round Table | Merlin | |
| Movie | 1987 | The Caller | The Caller | |
| Movie | 2023 | Moving On | Howard | |
| Movie | 2000 | Still Tickin': The Return of 'A Clockwork Orange' | Self | |
| Movie | 2004 | Pinocchio 3000 | Scamboli (voice) | |
| Movie | 2006 | O Lucky Malcolm! | Self | |
| Movie | 1993 | East Wind | General Smyslovsky | |
| Movie | 1988 | An Audience With Victoria Wood | Self | |
| Movie | 1983 | Cross Creek | Max Perkins | |
| Movie | 1990 | Disturbed | Dr. Derrick Russell | |
| Movie | 1991 | Assassin of the Tsar | Timofeyev / Yurovsky | |
| Movie | 2012 | Home Alone: The Holiday Heist | Sinclair | |
| Movie | N/A | The Spider | Von Wessel | |
| Movie | 1995 | The Surgeon | Dr. Stein | |
| Movie | 1985 | Arthur the King | King Arthur | |
| Movie | 2022 | The Walk | McLaughlin | |
| Movie | 2025 | The Partisan | Trench coat | |
| Movie | 2000 | Island of the Dead | Rupert King | |
| Movie | 1980 | Look Back in Anger | Jimmy Porter | |
| Movie | 2012 | Silent Night | Sheriff Cooper | |
| Movie | 1976 | The Collection | Bill | |
| Movie | 2013 | The Employer | The Employer | |
| Movie | 2025 | Et Tu | The Murderer | |
| Movie | 2013 | Sanitarium | Dr. Stenson | |
| Movie | 2013 | A Green Story | Barton | |
| Movie | 1971 | The Raging Moon | Bruce Pritchard | |
| Movie | 2013 | Richard The Lionheart | King Henry II | |
| Movie | 2009 | Starz Inside - Unforgettably Evil | Self | |
| Movie | 2011 | LEGO Hero Factory: Ordeal of Fire | Mr. Makuro (voice) | |
| Movie | 1997 | 2103: The Deadly Wake | Captain Sean Murdoch | |
| Movie | 1990 | Schweitzer | Albert Schweitzer | |
| Movie | 2004 | In Good Company | Teddy K (uncredited) | |
| Movie | 1999 | Southern Cross | Felipe Solano | |
| Movie | 1995 | Fatal Pursuit | Bechtel | |
| Movie | 1998 | The Gardener | Ben Carter | |
| Movie | 1979 | Echoes of the Sixties: A Musical Trip | Self | |
| Movie | 2015 | Some Kind of Beautiful | Gordon | |
| Movie | 1999 | Love Lies Bleeding | Malcolm | |
| Movie | 2008 | Michael Lives: The Making of Halloween | Self | |
| Movie | 2014 | Tbilisi, I Love You | | |
| Movie | 2013 | Zombex | Dr. Soulis | |
| Movie | 1997 | Giga Shadow | Yottskry | |
| Movie | 1981 | A Documentary on the Making of 'Gore Vidal's Caligula' | Self / Caligula | |
| Movie | 1978 | She Fell Among Thieves | Richard Chandos | |
| Movie | 2014 | Mischief Night | Mr. Smiles | |
| Movie | 2020 | Time Warp Vol. 1: Midnight Madness | Self | |
| Movie | 1985 | Gulag | The Englishman | |
| Movie | 2010 | The Making of Easy A | Self | |
| Movie | 2005 | Mirror Wars: Reflection One | Dick Murdoch | |
| Movie | 2007 | Lost Kubrick: The Unfinished Films of Stanley Kubrick | Narrator | |
| Movie | 2014 | Free Fall | Thaddeus Gault | |
| Movie | 1991 | Venins | Prof. Baldwin | |
| Movie | 2014 | Shock Value | Edmund Dean Huntley | |
| Movie | N/A | Last Train to Fortune | Cecil Peachtree | |
| Movie | 2009 | Phineas and Ferb Christmas Vacation! | Grandpa Fletcher (voice) | |
| Movie | 1996 | Where Truth Lies | Dr. Vernon Renquist | |
| Movie | 1996 | Yesterday's Target | Holden | |
| Movie | 1995 | Dangerous Indiscretion | Roger Everett | |
| Movie | 1997 | Asylum | Sullivan Rane / Doc | |
| Movie | 2012 | Final Cut: Ladies and Gentlemen | (archive footage) | |
| Movie | 2015 | The Black Hole | Mr. Simms | |
| Movie | 1989 | Mortacci | Edmondo | |
| Movie | 2024 | Cellphone | | |
| Movie | 2013 | Metalocalypse: The Doomstar Requiem - A Klok Opera | Vater Orlagg (voice) | |
| Movie | 2015 | Bereave | Garvey | |
| Movie | 2010 | LEGO Hero Factory: Rise of the Rookies | Mr. Makuro (voice) | |
| Movie | 2008 | Anatomy of Catastrophe: The Making of 'Doomsday' | Self | |
| Movie | 1994 | Milk Money | Waltzer | |
| Movie | 2017 | Yamasong: March of the Hollows | Lord Geer (voice) | |
| Movie | 2024 | Thelma | Harvey | |
| Movie | 2007 | My Roman Holiday With John Steiner | Self - Archive Footage | |
| Movie | 2000 | The David Cassidy Story | Jack Cassidy | |
| Movie | 1996 | Sex, Censorship and the Silver Screen | Quote Reader | |
| Movie | 2012 | LEGO Hero Factory: Breakout | Akiyama Makuro | |
| Movie | 2003 | Red Roses and Petrol | Enda Doyle | |
| Movie | 2007 | Never Apologize | Self | |
| Movie | 2012 | Stanley Kubrick in Focus | Self | |
| Movie | 2016 | 31 | Father Murder | |
| Movie | 2000 | St. Patrick: The Irish Legend | Quentin | |
| Movie | 1996 | Superman: The Last Son of Krypton | John Corben (voice) | |
| Movie | 1997 | Mr. Magoo | Austin Cloquet | |
| Movie | 2017 | Death Race 2050 | Chairman | |
| Movie | 2015 | The Soul of a Spy | | |
| Movie | 1999 | Sharks of the Deep Blue | Narrator | |
| Movie | 2013 | Meet the Small Potatoes | Lester Koop (voice) | |
| Movie | 2004 | Bobby Jones: Stroke of Genius | O.B. Keeler | |
| Movie | 2016 | The Mystery of Casa Matusita | Supay | |
| Movie | 2017 | Walk of Fame | Evan Polus | |
| Movie | 2011 | No Rest for the Wicked: A Basil & Moebius Adventure | Mr. Bloome | |
| Movie | 2015 | Kids vs Monsters | Boss Monster | |
| Movie | N/A | Summerhouse | | |
| Movie | 1996 | The Little Riders | Capt. Kessel | |
| Movie | 2014 | Kubrick Remembered | Self | |
| Movie | 1990 | Maggio musicale | Pier Francesco Ferraioli | |
| Movie | 2018 | Corbin Nash | Blind Prophet | |
| Movie | 1983 | Little Red Riding Hood | The Wolf a.k.a. Reginald Von Lupin / Narrator | |
| Movie | 2017 | Mississippi Murder | McGowen | |
| Movie | 2015 | Scooby-Doo! Moon Monster Madness | Sly Baron (voice) | |
| Movie | 2015 | Oceanus: Act One | Triton (Ship's Computer) | |
| Movie | 2015 | Lady Psycho Killer | Gerald Portersen | |
| Movie | 1993 | Your Guide to Star Trek: Generations | Self | |
| Movie | 2006 | Bye Bye Benjamin | Mr. Coleman | |
| Movie | 2017 | American Satan | Mr. Capricorn | |
| Movie | 2017 | Grow House | Dr. Doobie | |
| Movie | 1996 | Ringer | Noel | |
| Movie | 2018 | Dreams I Never Had | Judge Messner | |
| Movie | 2004 | Cast & Crew: If.... | Self - Interviewee | |
| Movie | 2008 | Blue Gold: World Water Wars | Narrator | |
| Movie | 2016 | The Search for Life in Space | Narrator | |
| Movie | 1999 | Stanley and Us | Self | |
| Movie | 1996 | Stanley Kubrick: The Invisible Man | Self | |
| Movie | 1989 | Il maestro | Walter Goldberg | |
| Movie | 2001 | Stanley Kubrick: A Life in Pictures | Self | |
| Movie | 2025 | Wizardream | The Wizard Mangodor | |
| Movie | 2019 | Bombshell | Rupert Murdoch | |
| Movie | 2011 | Turning Like Clockwork | Self | |
| Movie | 1999 | Can of Worms | Barnabus (voice) | |
| Movie | 2018 | Abnormal Attraction | Boogeyman | |
| Movie | 2011 | Once Upon a Time… A Clockwork Orange | Self | |
| Movie | 1982 | The Compleat Beatles | Narrator | |
| Movie | 2010 | DC Showcase Original Shorts Collection | Merlyn the Magnificent (segment "Green Arrow") (voice) | |
| Movie | 2011 | Santiago Files | Narrator | |
| Movie | 2020 | TimeCrafters: The Treasure of Pirate's Cove | Captain Lynch | |
| Movie | 2012 | The Artist: The Making of an American Romance | Self | |
| Movie | 2012 | Hollywood as Character: The Locations of The Artist | Himself | |
| Movie | 2020 | Time Warp Vol. 2: Horror and Sci-Fi | Self | |
| Movie | 2020 | The Big Ugly | Harris | |
| Movie | 2020 | Skin: A History of Nudity in the Movies | Self | |
| Movie | 2021 | Blood on the Crown | Colonel Saville | |
| Movie | 2010 | Monster Butler | Roy Fontaine | |
| Movie | 2020 | Free Lunch Express | Narrator | |
| Movie | 2020 | The Christmas Chronicles: Part Two | Hakan | |
| Movie | 2007 | Exitz | Percy | |
| Movie | 2004 | Hidalgo | Major Davenport | |
| Movie | 2005 | Jaws of the Pacific | Narrator (voice) | |
| Movie | 2021 | Pups Alone | Oliver (voice) | |
| Movie | 1994 | Seasons of the Heart | Alfred McGuinness | |
| Movie | 2022 | She Will | Hathbourne | |
| Movie | 2021 | A Wonderful Kingdom | Narrator | |
| Movie | N/A | Dirt | | |
| Movie | 1973 | O Lucky Man! Innovations in Entertainment | Himself | |
| Movie | N/A | Dog & Bull | | |
| Movie | N/A | Ever After | The Frog King (voice) | |
| Movie | 2014 | Elwood | Narrator (voice) | |
| Movie | 2009 | Behind The Scenes of Caligula | | |
| Movie | 2017 | Conspiracy of Fear | Evo | |
| TV Show | 1998 | Fantasy Island | Mr. Roarke | 13 |
| TV Show | 2003 | Teen Titans | Mad Mod (voice) | 2 |
| TV Show | 2006 | Metalocalypse | Vater Orlaag (voice) | 42 |
| TV Show | 1976 | Laurence Olivier Presents | | 0 |
| TV Show | 2002 | CSI: Miami | | 1 |
| TV Show | 1997 | Lexx | Yottskry | 1 |
| TV Show | 2006 | Heroes | | 0 |
| TV Show | 2007 | Phineas and Ferb | | 1 |
| TV Show | 2007 | Phineas and Ferb | Grandpa Reg (voice) | 1 |
| TV Show | 2002 | Monk | Julian Hodge | 1 |
| TV Show | 2004 | Entourage | | 4 |
| TV Show | 1989 | Tales from the Crypt | Donald Longtooth | 1 |
| TV Show | 1997 | South Park | A British Person (voice) | 1 |
| TV Show | 1993 | Frasier | Dr. Bruga (voice) | 1 |
| TV Show | 2007 | Masters of Science Fiction | Tibor Cargrew | 1 |
| TV Show | 1996 | Wing Commander Academy | | 13 |
| TV Show | 2024 | ARK: The Animated Series | Senator Lucius Casius Virilis (voice) | 6 |
| TV Show | 2015 | Dawn of the Croods | Skermiggleflop (voice) | 1 |
| TV Show | 2015 | We Bare Bears | Professor Lampwick (voice) | 2 |
| TV Show | 2017 | Castlevania | Varney of London (voice) | 10 |
| TV Show | 1996 | Our Friends in the North | Benny Barratt | 9 |
| TV Show | 1996 | Pearl | Professor Stephen Pynchon | 22 |
| TV Show | 1991 | Pebble Mill | Self | 1 |
| TV Show | 2007 | Phineas and Ferb | Grandpa Reginald Fletcher (voice) | 1 |
| TV Show | 1995 | The Outer Limits | Ship (voice) | 1 |
| TV Show | 1999 | The Late Late Show with Craig Kilborn | Self - Guest | 1 |
| TV Show | 1996 | Superman: The Animated Series | John Corben (voice) | 2 |
| TV Show | 1996 | Superman: The Animated Series | John Corben / Metallo (voice) | 2 |
| TV Show | 1992 | Batman: The Animated Series | Arcady Duvall (voice) | 1 |
| TV Show | 1996 | Superman: The Animated Series | Metallo (voice) | 2 |
| TV Show | 2012 | The High Fructose Adventures of Annoying Orange | | 30 |
| TV Show | 2007 | War and Peace | Prince Bolkonski | 4 |
| TV Show | 2011 | Franklin & Bash | Stanton Infeld | 40 |
| TV Show | 2004 | Justice League Unlimited | Metallo (voice) | 1 |
| TV Show | 2009 | Community | Professor Cornwallis | 2 |
| TV Show | 2004 | Entourage | Terrance McQuewick | 4 |
| TV Show | 2008 | The Mentalist | Bret Stiles | 5 |
| TV Show | 2006 | Psych | Ambassador Fanshaw | 1 |
| TV Show | 2006 | Heroes | Daniel Linderman | 10 |
| TV Show | 2021 | Gossip Girl | Roger Menzies | 3 |
| TV Show | 1987 | The Dame Edna Experience | Self | 1 |
| TV Show | 1982 | Faerie Tale Theatre | Reginald Von Lupin / The Wolf / Narrator (voice) | 1 |
| TV Show | 2022 | Son of a Critch | Pop | 52 |
| TV Show | 1994 | The Magic School Bus | (voice) | 1 |
| TV Show | 1978 | An Audience with... | Self | 1 |
| TV Show | 2002 | CSI: Miami | Darren Vogel | 2 |
| TV Show | 1977 | Beryl Reid | | 1 |
| TV Show | 2002 | Firestarter: Rekindled | John Rainbird | 2 |
| TV Show | 1986 | Monte Carlo | Christopher Quinn | 2 |
| TV Show | 2013 | Teen Titans Go! | Baxtory (voice) | 5 |
| TV Show | 2004 | Leçon de Cinéma | Self | 1 |
| TV Show | 2001 | The Grim Adventures of Billy and Mandy | Baron Von Ghoulish | 1 |
| TV Show | 1994 | Spider-Man | Whistler (voice) | 2 |
| TV Show | 2014 | Star Wars Rebels | Minister Hydan (voice) | 2 |
| TV Show | 2002 | ChalkZone | Barney the Encyclocentipedia (voice) | 2 |
| TV Show | 2005 | Robot Chicken | 1776 announcer/reporter | 1 |
| TV Show | 2006 | The Curse of King Tut's Tomb | Nathan Cairns | 2 |
| TV Show | 2001 | Law & Order: Criminal Intent | Jonas Slaughter | 1 |
| TV Show | 2015 | Chicago Med | Marvin Jaffrey | 1 |
| TV Show | 2017 | Jeff and Some Aliens | Zib Zog (voice) | 1 |
| TV Show | 2014 | Mozart in the Jungle | Thomas Pembridge | 40 |
| TV Show | 1977 | BBC2 Play of the Week | Chandos | 1 |
| TV Show | 1996 | The Great War and the Shaping of the 20th Century | Czar Nicholas II / Charles Stockwell / Stephen Graham (voice) | 1 |
| TV Show | 2019 | Scooby-Doo and Guess Who? | Malcolm McDowell (voice) | 1 |
| TV Show | 2020 | Truth Seekers | Richard | 8 |
| TV Show | 1993 | Late Night with Conan O'Brien | Self | 1 |
| TV Show | 1971 | Great Performances | Bill | 1 |
| TV Show | 1996 | Captain Simian & the Space Monkeys | Rhesus 2 (voice) | 14 |
