| Year | Title | Role | Notes |
| 1975–1976 | Saturday Night Live with Howard Cosell | Various characters | Television series; television debut; also writer |
| 1976 | The TVTV Show | |
| 1978 | Sesame Street | Man in Row Boat | Episode: "(#1186)" |
| 1978–1980, 1981–1982 | Saturday Night Live | Various characters | 52 episodes; Also writer |
| 1991 | Good Sports | John "Mac" MacKinney | 15 episodes |
| 1990–1992 | Get a Life | Gus Borden / Ted Bains | 13 episodes |
| 1992 | Married... with Children | Wayne | Episode: Kelly Doesn't Live Here Anymore |
| Wings | Coach Snyder | Television series |
| Frosty Returns | Mr. Twitchell | Voice, television special |
| Seinfeld | Mel Sanger | Episode: "The Bubble Boy" |
| 1993–1994 | Bakersfield P.D. | Sergeant Bill Hampton | 17 episodes |
| 1995 | Lois & Clark: The New Adventures of Superman | Harlan Black | Episode: "Chi of Steel" |
| 1995–1998 | Ellen | Burt Kovak | 2 episodes |
| 1996–1997 | Duckman | Agnes Delrooney | Voice, 10 episodes |
| 1997 | Nightmare Ned | Norm | Voice, episode: "My, How You've Grown" |
| Aaahh!!! Real Monsters | Mulligan / Cop | Voice, episode: "The Great Escape/Beast with Four Eyes" |
| 1997–1999 | Between Brothers | Stuart Franklin | 3 episodes |
| 1998 | Mr. Show with Bob and David | Referee | Episode: "It's Perfectly Understandishable" |
| 1998 | Recess | Tommy "The Tickler" Tate | Voice, episode: "Gretchen and the Secret of Yo" |
| 1999 | Smart Guy | Pete Gilroy | Episode: "Cross Talk" |
| CatDog | Santa Claus | Voice, episode: "A Very CatDog Christmas" |
| 1999–2000 | Love & Money | Finn McBride | 13 episodes |
| 1999–present | SpongeBob SquarePants | The Flying Dutchman | Voice, 14 episodes |
| 2000 | Jackie Chan Adventures | Gnome Cop | Voice, episode: "Tough Break" |
| Buzz Lightyear of Star Command | Panchax | Voice, episode: "Panic on Bathyos" |
| 2000–2007 | King of the Hill | Jack the Barber | Voice, 3 episodes |
| 2000–2001 | Family Guy | Salty / Bidder / Luke | Voice, 3 episodes |
| 2001 | The Angry Beavers | Smelly Jim | Voice, episode: "Dag Con Carny" |
| 2001–2006 | Yes, Dear | Mr. George Savitsky | Recurring role |
| 2002 | Teamo Supremo | The Chief | Voice, 4 episodes |
| 2003 | Justice League | Artie Bauman | Voice, episode: "Eclipsed" |
| 2005–2006 | The Buzz on Maggie | Chauncey Pesky | Voice, main role |
| 2005–2008 | My Gym Partner's a Monkey | Coach Tiffany Gills | Voice, 19 episodes |
| 2006 | Tom Goes to the Mayor | Bernie Fusterillo | Voice, episode: "Zoo Trouble" |
| 2008–2010 | The Marvelous Misadventures of Flapjack | Captain K'nuckles | Voice, 69 episodes |
| 2008 | Psych | Grandpa Spencer | Episode: "The Old and the Restless" |
| 2009 | The Goode Family | Charlie | Voice, 13 episodes |
| 2009–2018 | The Middle | Don Ehlert | 25 episodes |
| 2010 | WordGirl | Police officer | Voice, episode: "Earth Day Girl/A Hero, a Thief, a Store, and Its Owner" |
| Kick Buttowski: Suburban Daredevil | Glenn | Voice, episode: "Kicked Out/Kick the Habit" |
| 2011 | Supernatural | Robert Singer | Episode: "The French Mistake" |
| 2012 | Adventure Time | Prince Huge | Voice, episode: "The Hard Easy" |
| 2012–2013 | Motorcity | Jacob, Utiliton, Giant Peanut Butter Cup | Voice, 13 episodes |
| 2012–2014 | Sullivan & Son | Hank Murphy | 33 episodes |
| 2013 | Raising Hope | Walt | Episode: "Yo Zappa Do: Part 2" |
| Fish Hooks | Baby Face Bryant | Voice, 1 episode |
| 2014 | 2 Broke Girls | Blarney Bill | Episode: "And the Kilt Trip" |
| Christmas Under Wraps | Frank Holiday | TV movie |
| 2016 | It's Always Sunny in Philadelphia | Sea Captain | Episode: "The Gang Goes to Hell: Part 1" |