| Movie | 1995 | Leaving Las Vegas | Peter | |
| Movie | 1994 | Wagons East! | Phil Taylor | |
| Movie | 1993 | The Last Party | Self | |
| Movie | 1988 | The Wrong Guys | Richard | |
| Movie | 1993 | Robin Hood: Men in Tights | Prince John | |
| Movie | 1992 | Once Upon a Crime | Julian Peters | |
| Movie | 2012 | Excavating the 2000 Year Old Man | Self | |
| Movie | 2005 | The Aristocrats | Self | |
| Movie | 2005 | Confessions of an Action Star | Self | |
| Movie | 2012 | Vamps | Danny | |
| Movie | 2011 | Looking for Lenny | Self | |
| Movie | 1997 | The Maze | Markov | |
| Movie | 1999 | Game Day | Steve Adler | |
| Movie | 2011 | Method to the Madness of Jerry Lewis | Self | |
| Movie | 1997 | Drunks | Jim | |
| Movie | 1992 | The Danger of Love: The Carolyn Warmus Story | Edward Sanders | |
| Movie | 2007 | Mr. Warmth: The Don Rickles Project | Self | |
| Movie | 1996 | A Weekend in the Country | Bobby Stein | |
| Movie | 1997 | Hugo Pool | Chick Chicalini | |
| Movie | 2013 | Mel Brooks: Make a Noise | Self | |
| Movie | 2015 | Misery Loves Comedy | Self | |
| Movie | 1979 | Diary of a Young Comic | Billy Goldstein / Gondola | |
| Movie | 1982 | The Facts | Host | |
| Movie | 2015 | She's Funny That Way | Al Finkelstein | |
| Movie | 1985 | Richard Lewis: I'm In Pain | Self | |
| Movie | 1998 | The Elevator | Phil Milowski | |
| Movie | 2003 | The Very Best of America's Funniest Comedians | Self (archive footage) | |
| Movie | 1989 | That's Adequate | Pimples Lapedes | |
| Movie | 1996 | Richard Lewis: The Magical Misery Tour | Himself | |
| Movie | 2017 | Sandy Wexler | Testimonial | |
| Movie | 2018 | Bucky and the Squirrels | Richard Lewis | |
| Movie | 1999 | Larry David: Curb Your Enthusiasm | Self | |
| Movie | 2018 | The Great Buster: A Celebration | Self | |
| Movie | 2005 | Confessions of an Action Star | | |
| Movie | 1991 | The One, the Only... Groucho | Self | |
| Movie | 1993 | 'Robin Hood: Men in Tights' – The Legend Had It Coming | Self | |
| Movie | 2001 | Laughing Out Loud: America's Funniest Comedians | Self (archive footage) | |
| Movie | 1990 | Richard Lewis: I'm Doomed | Self | |
| Movie | 1988 | Richard Lewis: I'm Exhausted | Self | |
| Movie | 2021 | Emily @ the Edge of Chaos | Aristotle (voice) | |
| Movie | 1996 | Nichols and May: Take Two | Self | |
| Movie | 1988 | An All-Star Toast to the Improv | Self | |
| Movie | 1989 | Comic Relief III | Self | |
| Movie | 2010 | Just 3 Boyz | Shades (voice) | |
| Movie | 1981 | The 6th Annual Young Comedians | Self | |
| Movie | 2024 | Group Therapy | Self (archive footage) | |
| TV Show | 2002 | Presidio Med | Francis Weinod | 1 |
| TV Show | 1989 | The Simpsons | Golem (voice) | 1 |
| TV Show | 2001 | Dinner for Five | | 2 |
| TV Show | 2002 | The Dead Zone | Jack Jericho | 1 |
| TV Show | 2006 | 'Til Death | Miles Tunnicliff | 3 |
| TV Show | 1996 | The Daily Show | Self | 8 |
| TV Show | 2001 | Alias | Mitchell Yaeger | 1 |
| TV Show | 1992 | The Larry Sanders Show | Richard Lewis | 1 |
| TV Show | 2003 | Las Vegas | Stan | 1 |
| TV Show | 1989 | Tales from the Crypt | Vern (segment "Whirlpool") | 1 |
| TV Show | 1997 | The View | Self | 6 |
| TV Show | 2003 | Two and a Half Men | Stan | 1 |
| TV Show | 1995 | Dr. Katz, Professional Therapist | Richard (voice) | 1 |
| TV Show | 1992 | The Tonight Show with Jay Leno | | 1 |
| TV Show | 1999 | Law & Order: Special Victims Unit | Sportsman Larry | 1 |
| TV Show | 2002 | George Lopez | Phillip Nickleson | 1 |
| TV Show | 1998 | Hercules | Neurosis | 0 |
| TV Show | 2012 | Inside Comedy | Self | 1 |
| TV Show | 1996 | 7th Heaven | Richard Glass | 9 |
| TV Show | 1995 | MADtv | Self | 1 |
| TV Show | 1993 | Late Night with Conan O'Brien | Self - Guest | 5 |
| TV Show | 1986 | American Masters | Self | 1 |
| TV Show | 1989 | Anything But Love | Marty Gold | 56 |
| TV Show | 1993 | TriBeCa | | 7 |
| TV Show | 2001 | Revealed with Jules Asner | | 1 |
| TV Show | 1995 | A.J.'s Time Travelers | Edgar Allan Poe | 5 |
| TV Show | 1987 | Harry | Richard Breskin | 7 |
| TV Show | 1993 | Daddy Dearest | Steven Mitchell | 13 |
| TV Show | 1997 | Hiller and Diller | Neil Diller | 18 |
| TV Show | 2005 | Everybody Hates Chris | Kris | 1 |
| TV Show | 2014 | Late Night with Seth Meyers | Self | 1 |
| TV Show | 2010 | The Green Room with Paul Provenza | Self | 1 |
| TV Show | 2010 | Pound Puppies | Buddy (voice) | 1 |
| TV Show | 1962 | The Tonight Show Starring Johnny Carson | Self | 2 |
| TV Show | 1995 | Happily Ever After: Fairy Tales for Every Child | Old Beggar (voice) | 1 |
| TV Show | 2000 | Curb Your Enthusiasm | Richard Lewis | 45 |
| TV Show | 1999 | Law & Order: Special Victims Unit | Sportsman Larry (voice) | 1 |
| TV Show | 2014 | BoJack Horseman | Ziggy Abler (voice) | 1 |
| TV Show | 1998 | V.I.P. | Ronald Zane | 1 |
| TV Show | 1998 | Hollywood Squares | Self - Panelist | 10 |
| TV Show | 1993 | Late Show with David Letterman | Self - Guest | 1 |
| TV Show | 1982 | Late Night with David Letterman | Self - Guest | 2 |
