| — | The Sisters Rosensweig | Mervyn |
| — | Richard Lovely | Mr. Mouse |
| 2025 | The Gettysburg Address | Noah Brooks (voice) |
| — | Meteor | Dr. Chetwyn |
| — | Stealing Pulp Fiction | |
| 2024 | To the Journey : Looking Back at Star Trek : Voyager | Self |
| — | The Electric State | |
| — | Saturday TV Funhouse | Titey (voice) |
| 2024 | Pierre, Feuille, Ciseaux | Jonathan Fartjoke |
| 2024 | ROBLOX: The Movie | Jamies's Dad |
| 2023 | Leo | Jayda's Dad (voice) |
| 2023 | La Folle Histoire du monde 2 | Maurice Cheeks |
| 2023 | Dick Van Dyke: 98 Years of Magic | Self - Performer |
| 2022 | Out of Office | |
| 2022 | Cendrillon : Retrouvailles, édition spéciale | Self |
| 2022 | Killing Me Softly with His Songs | Self |
| 2022 | The Conspiracy | |
| 2021 | Star Trek: Prodigy | Doctor Noum (voice) |
| 2021 | Star Trek: Prodigy | Counselor Noum (voice) |
| 2021 | Celebrity Wheel of Fortune | Self - Contestant |
| 2021 | L'histoire des sitcoms | Self - Actor |
| 2021 | Broadway: Beyond the Golden Age | Self |
| 2020 | Las Pildoras de mi Novio | Dr. Sternbach |
| 2020 | Faith Based | Nicky Steele |
| 2020 | The Rocky Horror Musical Live Stream | Narrator |
| 2020 | Stars in the House | Self |
| 2020 | Stars in the House | Self - Special Guest |
| 2019 | Harley Quinn | Sy Borgman (voice) |
| 2019 | The Movies That Made Us | Self |
| 2019 | Mad About You | Jason Alexander |
| 2018 | The Conners | Pastor Phil |
| 2018 | The Portuguese Kid | Barry Dragonetti |
| 2018 | Bucky and the Squirrels | Jason Alexander |
| 2017 | Young Sheldon | Gene Lundy |
| 2017 | The Orville | Olix |
| 2017 | La Fabuleuse Mme Maisel | Asher Friedman |
| 2017 | The Truth Is in the Stars | Self |
| 2017 | Hit the Road | Ken Swallow |
| 2017 | Broadway: The Next Generation | Self |
| 2017 | Dinner with Dad | Jason Alexander |
| 2017 | Kody Kapow | Goji (voice) |
| 2016 | For the Love of Spock | Self |
| 2016 | Tom et Jerry - Retour à Oz | Mr. Bibb / The Nome King (voice) |
| 2016 | Best Worst Thing That Ever Could Have Happened... | Self |
| 2016 | Match Game | Self - Panelist |
| 2016 | The Last Laugh | Self |
| 2016 | The $100,000 Pyramid | Self |
| 2016 | To Tell the Truth | Self - Panelist |
| 2016 | There's Something About Romcoms | Self |
| 2016 | They're Real & They're Spectacular: Seinfeld Super Fans & The Summer of George | George Costanza (archive footage) |
| 2016 | The Mark Lembeck Technique | Mark Lembeck |
| 2015 | Joker | Pinky |
| 2015 | The Late Late Show with James Corden | Self |
| 2015 | The Grinder | Cliff Bemis |
| 2015 | Larry Gaye: hôtesse de l'air | Larry's Dad |
| 2015 | Misery Loves Comedy | Self |
| 2015 | Big Time in Hollywood, Fl | Jason Alexander |
| 2014 | Late Night with Seth Meyers | Self |
| 2014 | Tom et Jerry Show | Rick (voice) |
| 2014 | Penn Zero: Part-Time Hero | Coach Wallace (voice) |
| 2014 | TripTank | Doctor (voice) |
| 2014 | How Murray Saved Christmas | Doc Holiday (voice) |
| 2014 | Lucky Stiff | Vinnie Di Ruzzio |
| 2013 | Drunk History | William Tweed |
| 2013 | Hollywood Game Night | Self |
| 2013 | Kirstie | Stanford Temple |
| 2012 | Comedians in Cars Getting Coffee | Self |
| 2012 | Comedy Bang! Bang! | Inspector Gantlet |
| 2012 | Another Dirty Movie | Self (uncredited) |
| 2012 | Stars In Shorts | Sid Rosenthal |
| 2012 | Say It Ain't Solo | Himself |
| 2011 | Mes parrains sont magiques, le film : Grandis, Timmy! | Cosmo |
| 2011 | Talking Dead | Himself |
| 2011 | China, IL | Harold (voice) |
| 2011 | Dora the Explorer: Dora's Enchanted Forest Adventures | Owl (voice) |
| 2011 | The Voyages of Young Doctor Dolittle | Eugene (voice) |
| 2010 | Ça bulle | Mr. Nibbles |
| 2010 | Ça bulle | Mr. Nibbles (voice) |
| 2010 | Rock Slyde | Mailman Stan |
| 2010 | Quantum Quest: A Cassini Space Odyssey | Moronic (voice) |
| 2010 | The Marriage Ref | Self - Panelist |
| 2010 | Not Your Time | Sid Rosenthal |
| 2009 | Hatchi | Carl |
| 2009 | Community | Mountain Man |
| 2009 | The Cleveland Show | |
| 2009 | Météore : Chemin de la destruction | Dr. Chetwyn |
| 2008 | Shatner's Raw Nerve | Self |
| 2008 | Step It Up and Dance | |
| 2007 | Very Bad Strip, la cave se rebiffe ! | Dr. Yakov Achmed |
| 2007 | Jerry Seinfeld: Submarine Captain | Himself |
| 2007 | Thank God You're Here | Self |
| 2006 | The New Adventures of Old Christine | Dr. Palmer |
| 2006 | Hood Of Horror | British Record Mogul |
| 2006 | Rachael Ray | Self - Guest |
| 2006 | Farce of the Penguins | Penguin on Belly (voice) |
| 2006 | Comedy Central Roast of William Shatner | Self - Roastmaster |
| 2006 | Ira & Abby | Dr. Morris Saperstein |
| 2006 | How to Go Out on a Date in Queens | Johnny |
| 2006 | Talkshow with Spike Feresten | |
| 2006 | Where My Dogs At? | |
| 2005 | Esprits criminels | Prof. Rothchild |
| 2005 | American Dad! | Mr. Orlando (voice) |
| 2005 | American Dad! | Sal (voice) |
| 2005 | Tout le monde déteste Chris | |
| 2005 | Robot Chicken | Krampus (voice) |
| 2005 | The Aristocrats | Self |
| 2005 | The Late Late Show with Craig Ferguson | Self |
| 2005 | Earth to America | self |
| 2004 | A Christmas Carol | Jacob Marley / Marley's Ghost |
| 2004 | Seinfeld : How It Began | Himself/George Costanza |
| 2004 | The Tony Danza Show | Self - Guest |
| 2004 | Listen Up! | Tony Kleinman |
| 2003 | Mon oncle Charlie | Dr. Goodman |
| 2003 | Real Time with Bill Maher | Self |
| 2003 | The Ellen DeGeneres Show | Self |
| 2003 | Jimmy Kimmel Live! | |
| 2003 | The Very Best of America's Funniest Comedians | Self (archive footage) |
| 2002 | 101 Dalmatiens 2 : Sur la Trace des Héros | Lightning (voice) |
| 2002 | Monk | Marty Eels |
| 2002 | Le Bossu de Notre-Dame 2 : Le Secret de Quasimodo | Gargoyle Hugo (voice) |
| 2002 | La Treizième Dimension | Patient |
| 2002 | L'Homme qui sauva la fête de Noël | A.C. Gilbert |
| 2001 | L'Amour extra-large | Mauricio |
| 2001 | La Légende de Tarzan | Zutho (voice) |
| 2001 | Disney's tous en boîte | |
| 2001 | La Trompette magique | Father (voice) |
| 2001 | Primetime Glick | |
| 2001 | Good Day Live | Self |
| 2001 | Bob Patterson | Bob Patterson |
| 2001 | Being 'Shallow Hal' | Self |
| 2000 | Malcolm | Leonard |
| 2000 | Larry et son nombril | Jason Alexander |
| 2000 | Les Aventures de Rocky et Bullwinkle | Boris |
| 2000 | Son of the Beach | |
| 2000 | The Huntress | |
| 2000 | Let's Rap Fire Safety | |
| 1999 | Larry David: Curb Your Enthusiasm | Self |
| 1999 | Dilbert | Catbert (voice) |
| 1999 | Madeline: Perdue dans Paris | Uncle Horst / Henri (voice) |
| 1999 | The Late Late Show with Craig Kilborn | Self - Guest |
| 1999 | Jingle Bells | Elf (Voice) |
| 1999 | Love and Action in Chicago | Frank Bonner |
| 1999 | The N.Y. Friars Club Roast of Jerry Stiller | Self - Roastmaster |
| 1999 | Ultimate Trek : Star Trek's Greatest Moments | Host |
| 1999 | Sideshow: Alive on the Inside | Narrator |
| 1998 | Hercule | Poseidon |
| 1998 | Hercule | Poseidon (voice) |
| 1998 | Denial | Art Witz |
| 1998 | Hollywood Squares | Self - Panelist |
| 1998 | Titey | Titey (voice) |
| 1997 | La Légende de Cendrillon | Lionel |
| 1997 | Love! Valour! Compassion! | Buzz Hauser |
| 1996 | Le Bossu de Notre-Dame | Gargoyle Hugo (voice) |
| 1996 | Dunston, panique au palace | Robert Grant |
| 1996 | Muppets Tonight | Self |
| 1996 | Sex, Censorship and the Silver Screen | Quote Reader |
| 1996 | Critics' Choice Movie Awards | Himself |
| 1995 | Star Trek : Voyager | Kurros |
| 1995 | L'Ultime Souper | Anti-Enviroment |
| 1995 | Bye Bye Birdie | Albert J. Peterson |
| 1995 | Amour toujours | Michael Makeshift |
| 1994 | Friends | Earl |
| 1994 | Le Retour de Jafar | Abis Mal - the Chief of the Thieves (voice) |
| 1994 | Aladdin | Abis Mal (voice) |
| 1994 | Aladdin | Captain Albatross (voice) |
| 1994 | Aladdin | Abis Mal / Abnor Mal (voice) |
| 1994 | L'irrésistible North | North's Dad |
| 1994 | Le Journal | Marion Sandusky |
| 1994 | Blankman | Mr. Stone |
| 1994 | Duckmann | Duckman (voice) |
| 1994 | Down on the Waterfront | |
| 1993 | Têtes De Cône | Larry Farber |
| 1993 | For Goodness Sake | Electronics Store Customer |
| 1993 | Sexual Healing | Frank |
| 1992 | The Larry Sanders Show | Jason Alexander |
| 1992 | I Don't Buy Kisses Anymore | Bernie Fishbine |
| 1991 | Dinosaures | Grown Baby (voice) |
| 1991 | Dinosaures | Stu (voice) |
| 1991 | Dinosaures | The Job Wizard (voice) |
| 1991 | Dinosaures | Gus Molehill (voice) |
| 1991 | Dinosaures | Sexual Harris (voice) |
| 1991 | Dinosaures | General H. Norman Conquest (voice) |
| 1991 | Dinosaures | UFO! Host / Announcer (voice) |
| 1990 | Pretty Woman | Philip Stuckey |
| 1990 | L'Échelle de Jacob | Geary |
| 1990 | La Fièvre d'Aimer | Neil |
| 1990 | Dream On | Randall Townsend |
| 1989 | Les Simpson | Bourbon Verlander (voice) |
| 1989 | Seinfeld | George Costanza |
| 1988 | LIVE with Kelly and Mark | Self |
| 1988 | Favorite Son | Chris Van Allen |
| 1987 | Everything's Relative | Julian Beeby |
| 1986 | Mosquito Coast | Hardware Clerk |
| 1986 | Les Mémoires de Brighton Beach | Pool Player #1 |
| 1986 | Rockabye | Lt. Ernest Foy |
| 1984 | E/R | Harold Stickley |
| 1984 | E/R | |
| 1983 | Reading Rainbow | Himself - Narrator (voice) |
| 1982 | Newhart | |
| 1982 | Late Night with David Letterman | Self |
| 1981 | Carnage | Dave |
| 1981 | Senior Trip | Pete |
| 1980 | A Capitol Fourth | Self |
| 1975 | Saturday Night Live | Self - Host |
| 1975 | Saturday Night Live | Self - Cameo (uncredited) |
| 1956 | Tony Awards | Self - Presenter |
| 1949 | The Emmy Awards | Self |
