| Movie | 1998 | Meet Joe Black | Quince | |
| Movie | 1998 | There's Something About Mary | Sully | |
| Movie | 1991 | City Slickers | Lou | |
| Movie | 2004 | Hellboy | Tom Manning | |
| Movie | 1998 | Doctor Dolittle | Dr. Fish | |
| Movie | 1999 | Teaching Mrs. Tingle | Coach Wenchell | |
| Movie | 1999 | Girl, Interrupted | Dr. Potts | |
| Movie | 2003 | My Boss's Daughter | Ken | |
| Movie | 2005 | The Muppets' Wizard of Oz | Wizard | |
| Movie | 1981 | Saturday the 14th | Waldemar | |
| Movie | 2008 | Hellboy II: The Golden Army | Tom Manning | |
| Movie | 1991 | Life Stinks | Vance Crasswell | |
| Movie | 2009 | The Invention of Lying | Anthony James | |
| Movie | 1994 | Radioland Murders | Walt Whalen Jr. | |
| Movie | 2008 | Superhero Movie | Dr. Whitby | |
| Movie | 2004 | The SpongeBob SquarePants Movie | King Neptune (voice) | |
| Movie | 2000 | How the Grinch Stole Christmas | Mayor Augustus Maywho | |
| Movie | 1987 | Three O'Clock High | Mr. Rice | |
| Movie | 1983 | Mr. Mom | Jinx | |
| Movie | 2003 | Malibu's Most Wanted | Dr. Feldman | |
| Movie | 2010 | Operation: Endgame | Devil | |
| Movie | 1983 | The Man Who Wasn't There | Boris Potemkin | |
| Movie | 2009 | Monsters vs Aliens | Carl Murphy (voice) | |
| Movie | 2011 | Flypaper | Gordon Blythe | |
| Movie | 1995 | Heavyweights | Maury Garner | |
| Movie | 1984 | No Small Affair | Ken | |
| Movie | 2011 | The Hangover Part II | Sid Garner | |
| Movie | 1999 | My Teacher's Wife | Jack Boomer | |
| Movie | 2011 | Paul | Adam Shadowchild | |
| Movie | 1979 | ...And Justice for All | Jay Porter | |
| Movie | 2003 | Eloise at the Plaza | Mr. Salomone the Manager | |
| Movie | 1989 | Brenda Starr | Vladimir | |
| Movie | 2007 | Slipstream | Geek / Jeffrey / Dr. Geekman | |
| Movie | 2009 | The Hangover | Sid Garner | |
| Movie | 2001 | Get Well Soon | Mitchell | |
| Movie | 1983 | Cocaine: One Man's Seduction | Mort Broome | |
| Movie | 2011 | Lucky | Detective Harold Waylon | |
| Movie | 2003 | Under the Tuscan Sun | Lawyer (uncredited) | |
| Movie | 1993 | Living and Working in Space: The Countdown Has Begun | Dr. Stockton | |
| Movie | 2009 | Mutant Pumpkins from Outer Space | Carl Murphy (voice) | |
| Movie | 2011 | Win Win | Vigman | |
| Movie | 2011 | Mr. Popper's Penguins | Mr. Gremmins | |
| Movie | 1990 | Lisa | Mr. Larry Marks | |
| Movie | 1993 | A House in the Hills | Willie | |
| Movie | 2010 | Meeting Spencer | Harris Chappell | |
| Movie | 2001 | Never Again | Christopher | |
| Movie | 2008 | Hellboy: In Service of the Demon | Self | |
| Movie | 2013 | The Hangover Part III | Sid Garner | |
| Movie | 1986 | The Nativity | Eli (voice) | |
| Movie | 1993 | At Home with the Webbers | Gerald Webber | |
| Movie | 2012 | Branded | Bob Gibbons | |
| Movie | 2011 | Night of the Living Carrots | Carl Murphy (voice) | |
| Movie | 1990 | The Easter Story | Peter (voice) | |
| Movie | 1996 | The Man Who Captured Eichmann | Isser Harel | |
| Movie | 2013 | Phil Spector | Bruce Cutler | |
| Movie | 2009 | Prequel: The Dawn of Lying | Anthony | |
| Movie | 1993 | Jonny's Golden Quest | Dr. Zin | |
| Movie | 1995 | Jonny Quest vs. the Cyber Insects | Dr. Zin | |
| Movie | 2016 | The Last Laugh | Self | |
| Movie | 2010 | Tangled | Big Nose Thug (voice) | |
| Movie | 1999 | Muppets from Space | K. Edgar Singer | |
| Movie | 2020 | Disclosure | Self (archive footage) | |
| Movie | 2014 | Apartment Troubles | | |
| Movie | 2014 | The Clockwork Girl | Wilhelm the Tinkerer (voice) | |
| Movie | 2014 | A Merry Friggin' Christmas | Snowman (voice) | |
| Movie | 1997 | Weapons of Mass Distraction | Alan Blanchard | |
| Movie | 1996 | Big Bully | Art Lundstrum | |
| Movie | 2016 | The Accountant | Francis Silverberg | |
| Movie | 2015 | The D Train | Bill Shurmur | |
| Movie | 2005 | Earth to America | Self | |
| Movie | 1980 | Alcatraz: The Whole Shocking Story | Dankworth | |
| Movie | 1982 | Take Your Best Shot | Alden Pepper | |
| Movie | 2004 | Funky Monkey | Crane | |
| Movie | 1990 | Seriously... Phil Collins | Jeffrey Taglentini | |
| Movie | 1984 | The Three Wishes of Billy Grier | Dr. Lindsey | |
| Movie | 1981 | A Gun in the House | Lance Kessler | |
| Movie | 1994 | Another Midnight Run | Bernie Abbot | |
| Movie | 2003 | Scorched | Bank Employer | |
| Movie | 2016 | Trolls | King Peppy (voice) | |
| Movie | 2017 | The Death of Stalin | Georgy Malenkov | |
| Movie | 1983 | The Awakening of Candra | Professor Michael Silver | |
| Movie | 2011 | Five | Danny | |
| Movie | 1987 | Funny, You Don't Look 200: A Constitutional Vaudeville | Writer | |
| Movie | 2007 | My Friends Tigger & Pooh: Super Sleuth Christmas Movie | Santa (voice) | |
| Movie | 2017 | Tangled: Before Ever After | Big Nose (voice) | |
| Movie | 2018 | 55 Steps | Mort Cohen | |
| Movie | 2000 | Pollock | Clem Greenberg | |
| Movie | 2020 | Magic Camp | Roy Preston | |
| Movie | 2013 | Onion News Empire | David Bryant | |
| Movie | 2012 | For the Love of Money | Mr. Solomon | |
| Movie | 1982 | The Dream Chasers | Jeffrey Bauman | |
| Movie | 2013 | Monsters vs Aliens Stories | | |
| Movie | 2010 | Scooby-Doo! Abracadabra-Doo | Mr. Calvin Curdles (voice) | |
| Movie | 2007 | Not Just the Best of the Larry Sanders Show | | |
| Movie | 1992 | Crossing the Bridge | Uncle Alby | |
| Movie | 2003 | Eloise at Christmastime | Mr. Salomone the Manager | |
| Movie | 1990 | Pastime | Peter LaPorte | |
| Movie | 2004 | EuroTrip | Scott's Dad (uncredited) | |
| Movie | 1985 | Desert Hearts | Jerry (uncredited) | |
| Movie | 2007 | The ChubbChubbs Save Xmas | Santa Claus (voice) | |
| Movie | N/A | The Adventures of Drunky | God | |
| Movie | 1990 | A Quiet Little Neighborhood, a Perfect Little Murder | Don Hecker | |
| Movie | 1981 | The Star Maker | Harry Lanson | |
| Movie | 2010 | This Side of the Truth, A Truly 'Honest' Making of The Invention of Lying | Self | |
| Movie | 2013 | The Arrested Development Documentary Project | Self | |
| Movie | 1992 | Article 99 | Dr. Leo Krutz | |
| Movie | 2007 | The Making Of 'The Larry Sanders Show' | Hank Kingsley | |
| Movie | 2015 | China, Il The Musical | Professor Cakes | |
| Movie | 1972 | Summertime Killer | "Sully" Tambor | |
| TV Show | 2005 | Medium | Todd Emory / Allison Dubois | 1 |
| TV Show | 1984 | Murder, She Wrote | Russell Armstrong | 1 |
| TV Show | 1986 | L.A. Law | Gordon Salt | 3 |
| TV Show | 1994 | Duckman | Psychiatrist (voice) | 1 |
| TV Show | 1990 | American Dreamer | Joe Baines | 17 |
| TV Show | 2003 | The Ellen DeGeneres Show | Self | 4 |
| TV Show | 1972 | M*A*S*H | Reddish | 1 |
| TV Show | 2002 | 3-South | | 13 |
| TV Show | 2000 | CSI: Crime Scene Investigation | Jerzy Skaggs | 1 |
| TV Show | 1984 | Who's the Boss? | | 1 |
| TV Show | 1996 | The Real Adventures of Jonny Quest | Black Jack Lee (voice) | 1 |
| TV Show | 1975 | Starsky & Hutch | | 1 |
| TV Show | 1995 | Pinky and the Brain | Beetle Fiero (voice) | 1 |
| TV Show | 1985 | The Golden Girls | Dr. Stevens | 1 |
| TV Show | 2006 | Twenty Good Years | | 9 |
| TV Show | 1992 | The Larry Sanders Show | Hank Kingsley | 90 |
| TV Show | 1988 | LIVE with Kelly and Mark | | 1 |
| TV Show | 1985 | The Twilight Zone | Kyle Montgomery (segment "Dead Woman's Shoes") | 1 |
| TV Show | 2004 | Entourage | Jeffrey Tambor | 3 |
| TV Show | 1989 | Tales from the Crypt | Charlie Marno (segment "Dead Right") | 1 |
| TV Show | 1999 | The Early Show | Self | 1 |
| TV Show | 1975 | Barney Miller | William Klein | 1 |
| TV Show | 1991 | Dinosaurs | Hank Hibler (voice) | 1 |
| TV Show | 1981 | Hill Street Blues | | 7 |
| TV Show | 1979 | The Ropers | Jeffrey P. Brookes III | 28 |
| TV Show | 2012 | Inside Comedy | Self | 1 |
| TV Show | 1973 | Kojak | Medical Examiner | 1 |
| TV Show | 1977 | Three's Company | Winston Cromwell III | 1 |
| TV Show | 1997 | The Practice | Sid Herman | 2 |
| TV Show | 1987 | Max Headroom | Murray | 14 |
| TV Show | 2006 | The New Adventures of Old Christine | Neil | 1 |
| TV Show | 1995 | MADtv | Self | 1 |
| TV Show | 1993 | Late Night with Conan O'Brien | Self - Guest | 2 |
| TV Show | 2003 | Arrested Development | George Bluth Sr. | 84 |
| TV Show | 1982 | 9 to 5 | Franklin Hart | 4 |
| TV Show | 1986 | Mr. Sunshine | Paul Stark | 11 |
| TV Show | 2009 | Archer | Torvald Utne (voice) | 1 |
| TV Show | 2002 | That Was Then | | 4 |
| TV Show | 2008 | Welcome to the Captain | Uncle Saul | 5 |
| TV Show | 1989 | Studio 5-B | | 10 |
| TV Show | 2007 | WordGirl | | 209 |
| TV Show | 1997 | The Wonderful World of Disney | | 1 |
| TV Show | 2010 | Scooby-Doo! Mystery Incorporated | Gill Littlefoot (voice) | 1 |
| TV Show | 1999 | The Late Late Show with Craig Kilborn | Self | 2 |
| TV Show | 1999 | Everything's Relative | Jake Gorelick | 5 |
| TV Show | 1992 | Batman: The Animated Series | Crocker (voice) | 1 |
| TV Show | 1990 | Bill & Ted's Excellent Adventures | | 1 |
| TV Show | 2001 | Next Caller | Jefferson | 2 |
| TV Show | 1989 | Doogie Howser, M.D. | | 1 |
| TV Show | 2012 | Bent | Walt Riggins | 6 |
| TV Show | 2011 | The Trivial Pursuits of Arthur Banks | | 3 |
| TV Show | 2002 | Ozzy & Drix | The Mole (voice) | 3 |
| TV Show | 1978 | Taxi | Congressman Walter Griswald | 1 |
| TV Show | 2014 | Transparent | Maura Pfefferman | 40 |
| TV Show | 2005 | The Colbert Report | Self | 1 |
| TV Show | 2006 | Psych | Lloyd French | 2 |
| TV Show | 1998 | Hollywood Squares | Self - Panelist | 20 |
| TV Show | 1999 | Law & Order: Special Victims Unit | Lester Cohen | 4 |
| TV Show | 1977 | Three's Company | Tom Miller | 1 |
| TV Show | 1977 | Three's Company | Phillip Greene | 1 |
| TV Show | 2014 | Late Night with Seth Meyers | Self | 2 |
| TV Show | 2014 | Jennifer Falls | Don Hirsch | 1 |
| TV Show | 2015 | Close Up with The Hollywood Reporter | Self | 1 |
| TV Show | 2011 | Bob's Burgers | Captain Flarty (voice) | 1 |
| TV Show | 2012 | Robot and Monster | St. Crispy (voice) | 1 |
| TV Show | 1998 | Hercules | King Salmoneus (voice) | 1 |
| TV Show | 2004 | Game Over | Dr. Zed (voice) | 2 |
| TV Show | 1998 | Hollywood Squares | Self - Announcer (voice) | 180 |
| TV Show | 2010 | Raising Hope | Arnold | 1 |
| TV Show | 2009 | Archer | Len Trexler (voice) | 10 |
| TV Show | 2017 | The Orville | Ben Mercer | 1 |
| TV Show | 2018 | The Zen Diaries of Garry Shandling | Self | 2 |
| TV Show | 2000 | Sammy | Steve (voice) | 1 |
| TV Show | 1985 | Robert Kennedy & His Times | Pierre Salinger | 3 |
| TV Show | 1983 | Sadat | Sharaff | 2 |
| TV Show | 1981 | Hill Street Blues | Judge Alan Wachtel | 8 |
| TV Show | 1992 | The Burden of Proof | Sennett | 2 |
| TV Show | 1977 | The Love Boat | Lawrence Jurgens | 1 |
| TV Show | 2005 | The Reichen Show | Self - Guest | 1 |
| TV Show | 2014 | The Tonight Show Starring Jimmy Fallon | Self | 1 |
| TV Show | 2009 | The Good Wife | Judge George Kluger | 4 |
| TV Show | 2001 | The Proud Family | Randolph Verascola (voice) | 1 |
| TV Show | 2010 | The Cat in the Hat Knows a Lot About That! | Bettys friend (voice) | 147 |
| TV Show | 2010 | Rex Is Not Your Lawyer | Dr. Barry Cohen | 1 |
| TV Show | 2011 | China, IL | Professor Cakes (voice) | 30 |
| TV Show | 2016 | Brad Neely's Harg Nallin' Sclopio Peepio | (voice) | 1 |
| TV Show | 1977 | The Love Boat | Harold Rogers | 1 |
| TV Show | 1998 | The Lionhearts | (voice) | 3 |
| TV Show | 1980 | Alcatraz: The Whole Shocking Story | Dankworth | 2 |
| TV Show | 2010 | Running Wilde | Steven's Father | 1 |
| TV Show | 1990 | Law & Order | Barry Dilwynn | 1 |
| TV Show | 2017 | Rapunzel's Tangled Adventure | Big Nose (voice) | 4 |
| TV Show | 2011 | Bubble Guppies | Night Wizard (voice) | 2 |
| TV Show | 1993 | Late Night with Conan O'Brien | Self | 1 |
| TV Show | 1977 | The Love Boat | Mr. Harold Rogers | 1 |
| TV Show | 2015 | Star vs. the Forces of Evil | Glossaryck (voice) | 13 |
| TV Show | 2008 | Batman: The Brave and the Bold | Crazy Quilt / Green / Red (voice) | 1 |
| TV Show | 2006 | The Megan Mullally Show | Self - Guest | 1 |
| TV Show | 2014 | Variety Studio: Actors on Actors | Self | 1 |
| TV Show | 2011 | Love Bites | Dr. O | 1 |
| TV Show | 1998 | Hollywood Squares | Self | 5 |
| TV Show | 1985 | The Twilight Zone | (segment "The World Next Door") | 1 |
| TV Show | 2013 | The Millers | Ed Dolan | 2 |
| TV Show | 1981 | Hill Street Blues | Attorney Alan Wachtel | 1 |
| TV Show | 1999 | The Lot | Myron Sylver | 1 |
| TV Show | 2003 | DreamWorks 6 Spooky Stories Collection | Carl Murphy (voice) | 2 |
| TV Show | 2012 | Doc McStuffins | Santa Claus (voice) | 1 |