| Movie | 1990 | Pretty Woman | Philip Stuckey | |
| Movie | 2023 | Leo | Jayda's Dad (voice) | |
| Movie | 1996 | The Hunchback of Notre Dame | Gargoyle Hugo (voice) | |
| Movie | 1990 | Jacob's Ladder | Geary | |
| Movie | 1986 | Brighton Beach Memoirs | Pool Player #1 | |
| Movie | 1995 | The Last Supper | Anti-Enviroment | |
| Movie | 1994 | Blankman | Mr. Stone | |
| Movie | 1986 | The Mosquito Coast | Hardware Clerk | |
| Movie | 1981 | The Burning | Dave | |
| Movie | 1994 | North | North's Dad | |
| Movie | 2010 | Quantum Quest: A Cassini Space Odyssey | Moronic (voice) | |
| Movie | 1994 | The Paper | Marion Sandusky | |
| Movie | 2002 | The Hunchback of Notre Dame II | Gargoyle Hugo (voice) | |
| Movie | 2006 | Farce of the Penguins | Penguin on Belly (voice) | |
| Movie | 1993 | Coneheads | Larry Farber | |
| Movie | 2001 | Shallow Hal | Mauricio | |
| Movie | 2009 | Hachi: A Dog's Tale | Carl | |
| Movie | 2003 | 101 Dalmatians II: Patch's London Adventure | Lightning (voice) | |
| Movie | 1990 | White Palace | Neil | |
| Movie | 2004 | A Christmas Carol | Jacob Marley / Marley's Ghost | |
| Movie | 1995 | Bye Bye Birdie | Albert J. Peterson | |
| Movie | 1997 | Cinderella | Lionel | |
| Movie | 2005 | The Aristocrats | Self | |
| Movie | 2006 | Snoop Dogg's Hood of Horror | British Record Mogul | |
| Movie | 2010 | Rock Slyde | Mailman Stan | |
| Movie | 2002 | The Man Who Saved Christmas | A.C. Gilbert | |
| Movie | 1998 | Denial | Art Witz | |
| Movie | 1993 | For Goodness Sake | Electronics Store Customer | |
| Movie | 1997 | Love! Valour! Compassion! | Buzz Hauser | |
| Movie | 1996 | Dunston Checks In | Robert Grant | |
| Movie | 1998 | Titey | Titey (voice) | |
| Movie | 2000 | The Adventures of Rocky & Bullwinkle | Boris | |
| Movie | 2016 | There's Something About Romcoms | Self | |
| Movie | 2011 | A Fairly Odd Movie: Grow Up, Timmy Turner! | Cosmo | |
| Movie | 1992 | I Don't Buy Kisses Anymore | Bernie Fishbine | |
| Movie | 2001 | The Trumpet of the Swan | Father (voice) | |
| Movie | 2006 | How to Go Out on a Date in Queens | Johnny | |
| Movie | 1995 | For Better or Worse | Michael Makeshift | |
| Movie | 2012 | Stars In Shorts | Sid Rosenthal | |
| Movie | 2011 | The Voyages of Young Doctor Dolittle | Eugene (voice) | |
| Movie | 2007 | Jerry Seinfeld: Submarine Captain | Himself | |
| Movie | 2016 | The Last Laugh | Self | |
| Movie | 1986 | Rockabye | Lt. Ernest Foy | |
| Movie | 1999 | Madeline: Lost in Paris | Uncle Horst / Henri (voice) | |
| Movie | 1994 | Down on the Waterfront | | |
| Movie | 2015 | Wild Card | Pinky | |
| Movie | 2025 | The Electric State | Ted / Wingman | |
| Movie | 2022 | Cinderella: The Reunion, A Special Edition of 20/20 | Self | |
| Movie | 2022 | Out of Office | | |
| Movie | 1994 | The Return of Jafar | Abis Mal - the Chief of the Thieves (voice) | |
| Movie | 2014 | Lucky Stiff | Vinnie Di Ruzzio | |
| Movie | 2023 | Dick Van Dyke: 98 Years of Magic | Self - Performer | |
| Movie | 1999 | Jingle Bells | Elf (Voice) | |
| Movie | 2015 | Misery Loves Comedy | Self | |
| Movie | 2005 | Earth to America | self | |
| Movie | 2012 | National Lampoon's Another Dirty Movie | Self (uncredited) | |
| Movie | 2010 | Not Your Time | Sid Rosenthal | |
| Movie | 1999 | Sideshow: Alive on the Inside | Narrator | |
| Movie | 2006 | Comedy Central Roast of William Shatner | Self - Roastmaster | |
| Movie | 2022 | Killing Me Softly with His Songs | Self | |
| Movie | 2006 | Ira & Abby | Dr. Morris Saperstein | |
| Movie | 2004 | Seinfeld: How It Began | Self/George Costanza | |
| Movie | 2022 | The Conspiracy | | |
| Movie | 2015 | Larry Gaye: Renegade Male Flight Attendant | Larry's Dad | |
| Movie | 2017 | Broadway: The Next Generation | Self | |
| Movie | 1996 | Sex, Censorship and the Silver Screen | Quote Reader | |
| Movie | 2007 | The Grand | Dr. Yakov Achmed | |
| Movie | 1993 | Sexual Healing | Frank | |
| Movie | 2014 | How Murray Saved Christmas | Doc Holiday (voice) | |
| Movie | 2011 | Dora the Explorer: Dora's Enchanted Forest Adventures | Owl (voice) | |
| Movie | 2003 | The Very Best of America's Funniest Comedians | Self (archive footage) | |
| Movie | 2012 | Say It Ain't Solo | Himself | |
| Movie | 2025 | Stealing Pulp Fiction | Dr. Mendelbaum | |
| Movie | 1999 | Ultimate Trek: Star Trek's Greatest Moments | Host | |
| Movie | 2016 | For the Love of Spock | Self | |
| Movie | 2000 | Let's Rap Fire Safety | | |
| Movie | 2016 | Best Worst Thing That Ever Could Have Happened... | Self | |
| Movie | 2017 | The Truth Is in the Stars | Self | |
| Movie | 2018 | Bucky and the Squirrels | Jason Alexander | |
| Movie | 1999 | Larry David: Curb Your Enthusiasm | Self | |
| Movie | 1999 | The N.Y. Friars Club Roast of Jerry Stiller | Self - Roastmaster | |
| Movie | 2020 | My Boyfriend's Meds | Dr. Sternbach | |
| Movie | 1999 | Love and Action in Chicago | Frank Bonner | |
| Movie | 2018 | The Portuguese Kid | Barry Dragonetti | |
| Movie | 2020 | Faith Based | Nicky Steele | |
| Movie | 2025 | The Gettysburg Address | Noah Brooks (voice) | |
| Movie | 1981 | Senior Trip | Pete | |
| Movie | 2001 | Being 'Shallow Hal' | Self | |
| Movie | 2016 | Tom and Jerry: Back to Oz | Mr. Bibb / The Nome King (voice) | |
| Movie | 2020 | The Rocky Horror Musical Live Stream | Narrator | |
| Movie | N/A | The Sisters Rosensweig | Mervyn | |
| Movie | 2016 | The Mark Lembeck Technique | Mark Lembeck | |
| Movie | 2021 | Broadway: Beyond the Golden Age | Self | |
| Movie | N/A | Leo 2 | | |
| Movie | 2004 | The Seinfeld Story | Self | |
| Movie | 1995 | A Tribute to Stephen Sondheim | | |
| Movie | 2015 | China, Il The Musical | Harold | |
| Movie | 2025 | Paddy Chayefsky: Collector of Words | Self | |
| Movie | 2022 | Dunston Checks Out | Jason Alexander (archival footage) | |
| Movie | 1998 | It's Tough to be a Bug | Weevil Kneevil | |
| TV Show | 2006 | Talkshow with Spike Feresten | | 1 |
| TV Show | 1994 | Duckman | Duckman (voice) | 70 |
| TV Show | 2000 | Son of the Beach | | 1 |
| TV Show | 2005 | Everybody Hates Chris | | 2 |
| TV Show | 1989 | Seinfeld | George Costanza | 180 |
| TV Show | 2003 | The Ellen DeGeneres Show | Self | 2 |
| TV Show | 2004 | The Tony Danza Show | Self - Guest | 3 |
| TV Show | 1990 | Dream On | Randall Townsend | 1 |
| TV Show | 2003 | Jimmy Kimmel Live! | | 1 |
| TV Show | 1994 | Friends | Earl | 1 |
| TV Show | 1995 | Star Trek: Voyager | Kurros | 1 |
| TV Show | 2002 | Monk | Marty Eels | 1 |
| TV Show | 1992 | The Larry Sanders Show | Jason Alexander | 1 |
| TV Show | 2001 | The Legend of Tarzan | Zutho (voice) | 1 |
| TV Show | 2001 | Disney's House of Mouse | | 0 |
| TV Show | 1991 | Dinosaurs | Grown Baby (voice) | 1 |
| TV Show | 1994 | Aladdin | Abis Mal (voice) | 10 |
| TV Show | 1998 | Hercules | Poseidon | 0 |
| TV Show | 1984 | E/R | Harold Stickley | 6 |
| TV Show | 1982 | Newhart | | 1 |
| TV Show | 2006 | The New Adventures of Old Christine | Dr. Palmer | 1 |
| TV Show | 2000 | The Huntress | | 1 |
| TV Show | 1982 | Late Night with David Letterman | Self | 1 |
| TV Show | 1996 | Muppets Tonight | Self | 2 |
| TV Show | 2001 | Bob Patterson | Bob Patterson | 10 |
| TV Show | 2004 | Listen Up! | Tony Kleinman | 22 |
| TV Show | 1984 | E/R | | 1 |
| TV Show | 2005 | The Late Late Show with Craig Ferguson | Self | 1 |
| TV Show | 1987 | Everything's Relative | Julian Beeby | 10 |
| TV Show | 2006 | Where My Dogs At? | | 1 |
| TV Show | 2008 | Step It Up and Dance | | 1 |
| TV Show | 2009 | The Cleveland Show | | 1 |
| TV Show | 2010 | The Marriage Ref | Self - Panelist | 1 |
| TV Show | 1999 | The Late Late Show with Craig Kilborn | Self - Guest | 1 |
| TV Show | 2001 | Good Day Live | Self | 1 |
| TV Show | 1949 | The Emmy Awards | Self | 1 |
| TV Show | 2010 | Fish Hooks | Mr. Nibbles | 0 |
| TV Show | 2009 | Meteor | Dr. Chetwyn | 2 |
| TV Show | 1975 | Saturday Night Live | Self - Host | 1 |
| TV Show | 2001 | Critics Choice Awards | Self | 1 |
| TV Show | 2009 | Community | Mountain Man | 1 |
| TV Show | 2005 | American Dad! | Mr. Orlando (voice) | 1 |
| TV Show | 2019 | The Movies That Made Us | Self | 1 |
| TV Show | 2012 | Comedy Bang! Bang! | Inspector Gantlet | 1 |
| TV Show | 2013 | Drunk History | William Tweed | 1 |
| TV Show | 2015 | The Grinder | Cliff Bemis | 4 |
| TV Show | 2003 | Two and a Half Men | Dr. Goodman | 1 |
| TV Show | 1988 | Favorite Son | Chris Van Allen | 3 |
| TV Show | 2014 | Late Night with Seth Meyers | Self | 1 |
| TV Show | 2011 | Talking Dead | Self | 1 |
| TV Show | 2015 | The Late Late Show with James Corden | Self | 1 |
| TV Show | 1994 | Aladdin | Captain Albatross (voice) | 1 |
| TV Show | 1994 | Aladdin | Abis Mal / Abnor Mal (voice) | 1 |
| TV Show | 2015 | Big Time in Hollywood, Fl | Jason Alexander | 1 |
| TV Show | 2002 | The Twilight Zone | Patient | 1 |
| TV Show | 2014 | The Tom and Jerry Show | Rick (voice) | 52 |
| TV Show | 1991 | Dinosaurs | Stu (voice) | 1 |
| TV Show | 1998 | Hollywood Squares | Self - Panelist | 10 |
| TV Show | 2014 | Penn Zero: Part-Time Hero | Coach Wallace (voice) | 1 |
| TV Show | 2010 | Fish Hooks | Mr. Nibbles (voice) | 3 |
| TV Show | 1956 | Tony Awards | Self - Presenter | 1 |
| TV Show | 2021 | History of the Sitcom | Self - Actor | 8 |
| TV Show | 1983 | Reading Rainbow | Himself - Narrator (voice) | 1 |
| TV Show | 2017 | Hit the Road | Ken Swallow | 10 |
| TV Show | 2017 | Dinner with Dad | Jason Alexander | 8 |
| TV Show | 2017 | The Marvelous Mrs. Maisel | Asher Friedman | 1 |
| TV Show | 2014 | TripTank | Doctor (voice) | 1 |
| TV Show | 2016 | Match Game | Self - Panelist | 6 |
| TV Show | 2008 | Shatner's Raw Nerve | Self | 1 |
| TV Show | 2016 | The $100,000 Pyramid | Self | 1 |
| TV Show | 2017 | Kody Kapow | Goji (voice) | 22 |
| TV Show | 2005 | Criminal Minds | Prof. Rothchild | 1 |
| TV Show | 2019 | Harley Quinn | Sy Borgman (voice) | 13 |
| TV Show | 2017 | The Orville | Olix | 2 |
| TV Show | 1991 | Dinosaurs | Gus Molehill (voice) | 1 |
| TV Show | 1991 | Dinosaurs | The Job Wizard (voice) | 1 |
| TV Show | 1991 | Dinosaurs | General H. Norman Conquest (voice) | 1 |
| TV Show | 1991 | Dinosaurs | Sexual Harris (voice) | 1 |
| TV Show | 1991 | Dinosaurs | UFO! Host / Announcer (voice) | 1 |
| TV Show | 2012 | Comedians in Cars Getting Coffee | Self | 1 |
| TV Show | 2006 | Rachael Ray | Self - Guest | 1 |
| TV Show | 2018 | The Conners | Pastor Phil | 2 |
| TV Show | 2021 | Star Trek: Prodigy | Doctor Noum (voice) | 7 |
| TV Show | 2011 | China, IL | Harold (voice) | 10 |
| TV Show | 1999 | Dilbert | Catbert (voice) | 9 |
| TV Show | 2020 | Stars in the House | Self | 1 |
| TV Show | 2020 | Stars in the House | Self - Special Guest | 1 |
| TV Show | 1975 | Saturday Night Live | Self - Cameo (uncredited) | 1 |
| TV Show | 2017 | Young Sheldon | Gene Lundy | 5 |
| TV Show | 1980 | A Capitol Fourth | Self | 44 |
| TV Show | 2005 | Robot Chicken | Krampus (voice) | 1 |
| TV Show | 2000 | Curb Your Enthusiasm | Jason Alexander | 5 |
| TV Show | 1989 | The Simpsons | Bourbon Verlander (voice) | 1 |
| TV Show | 2005 | American Dad! | Sal (voice) | 1 |
| TV Show | 2003 | Real Time with Bill Maher | Self | 8 |
| TV Show | 2013 | Kirstie | Stanford Temple | 1 |
| TV Show | 2013 | Hollywood Game Night | Self | 2 |
| TV Show | 2019 | Mad About You | Jason Alexander | 1 |
| TV Show | 2001 | Primetime Glick | | 1 |
| TV Show | 2023 | History of the World: Part II | Maurice Cheeks | 1 |
| TV Show | 1988 | LIVE with Kelly and Mark | Self - Guest | 1 |
| TV Show | 2021 | Star Trek: Prodigy | Counselor Noum (voice) | 16 |
| TV Show | N/A | Saturday TV Funhouse | Titey (voice) | 1 |
| TV Show | 2024 | Rock, Paper, Scissors | Jonathan Fartjoke (voice) | 1 |
| TV Show | 1998 | Hercules | Poseidon (voice) | 5 |
| TV Show | 2016 | To Tell the Truth | Self - Panelist | 2 |
| TV Show | 2000 | Malcolm in the Middle | Leonard | 1 |
| TV Show | 2007 | Thank God You're Here | Self | 1 |
| TV Show | 2021 | Celebrity Wheel of Fortune | Self - Contestant | 1 |
| TV Show | 2024 | Y llegaron de noche | Carl Laemmle | 7 |
| TV Show | 1998 | Hollywood Squares | | 5 |
| TV Show | 1996 | Remember WENN | Alan Ballinger | 1 |
| TV Show | 2011 | Harry's Law | Richard Cross | 1 |
| TV Show | 2021 | The Problem with Jon Stewart | Jeff Bezos | 1 |
| TV Show | 2011 | Franklin & Bash | Carter Lang | 1 |
