| Year | Title | Role | Notes |
| 2004 | Garth Marenghi's Darkplace | Todd Rivers / Dr. Lucien Sanchez | 6 episodes |
| The Mighty Boosh | Dixon Bainbridge | 4 episodes |
| AD/BC: A Rock Opera | Innkeeper / Tim Wynde | Television special; also writer and composer |
| 2006 | Snuff Box | Matt / Various characters | 6 episodes; also co-creator, writer and composer |
| Man to Man with Dean Learner | Various characters | 5 episodes |
| Saxondale | Geoff | 2 episodes; also composer |
| 2007 | The Peter Serafinowicz Show | Various characters |
| 2007–2013 | The IT Crowd | Douglas Reynholm | 16 episodes |
| 2008 | The Wrong Door | Various characters | 3 episodes; also writer |
| 2008–2009 | The Sarah Silverman Program | Sir Corin Ashley / Owl | 2 episodes |
| 2009 | Svengali | Jeremy Braines | Television short |
| 2010 | The Suits | Voice |
| Five Daughters | Mirror Journalist | Episode |
| 2011 | Duckworth | Turk Cinnamon | Pilot |
| Aqua Teen Hunger Force | Allen (voice) | Episode: "Allen" |
| Shooting Stars | Vangelis | Episode |
| 2012 | Loserville | Hotelier | Television special |
| 2012–2015 | Toast of London | Steven Toast | 19 episodes; also co-creator, writer and composer |
| 2013 | Portlandia | Squiggleman | Episode: "Squiggleman" |
| It's Kevin | Sex Pistol | Episode |
| 2014 | Lucas Bros. Moving Co. | OG Sherlock Kush (voice) | Episode: "Tales from the Hoodie" |
| 2014–2015 | House of Fools | Beef | 13 episodes |
| 2015 | Community | Professor Roger DeSalvo | Episode: "Grifting 101" |
| Major Lazer | Professor Teacher (voice) | 2 episodes |
| Matt Berry Does.... | Narrator | 6 Shorts (5 broadcast) |
| Randy Cunningham: 9th Grade Ninja | Brawn Brickwall (voice) | Episode: "The Brawn Also Rises" |
| Harvey Beaks | Doctor Roberts (voice) | 2 episodes |
| 2016 | Morgana Robinson's The Agency | Tony | Episode |
| The Last Dragonslayer | King Snodd | Television film |
| Professor Branestawm Returns | Professor Awfulshirt |
| 2018–2023 | Disenchantment | Prince Merkimer (voice) | 13 episodes |
| 2019 | Year of the Rabbit | Detective Inspector Rabbit | 6 episodes |
| Archer | Mr. Deadly (voice) | Episode: "Archer: 1999 -- Mr. Deadly Goes to Town" |
| Twelve Forever | Butt Witch (voice) | 9 episodes |
| The Road to Brexit | Michael Squeamish | Television special |
| 2019–2024 | Moominvalley | Moominpappa (voice) | 26 episodes |
| What We Do in the Shadows | Leslie "Laszlo" Cravensworth | Main cast |
| 2020 | Squeamish About | Michael Squeamish (voice) | 4 episodes; also writer |
| 2021 | The Watch | Gawain (voice) | 5 episodes |
| 2021–2022 | The Book of Boba Fett | 8D8 (voice) |
| 2022 | Toast of Tinseltown | Steven Toast | 6 episodes; also co-creator and writer |
| 2023 | Great Expectations | Mr. Pumblechuck | Miniseries |
| Last Week Tonight with John Oliver | The Sad Tale of Henry the Engine narrator | Season 10 Episode 20 |
| 2023–present | Krapopolis | Shlub, Paizo (voices) | Main role |
| 2024 | The Simpsons | Chester Arborday (voice) | Episode: "Lisa Gets an F1" |
| Curb Your Enthusiasm | Les McCrabb | Episode: "Ken/Kendra" |
| Fallout | Snip Snip (voice) | Episode: "The Ghouls" |
| Mr. Handy/Sebastian Leslie | Episode: "The Trap" |
| 2025 | Watson | Sherlock Holmes (voice) | Episode: "Teeth Marks" |
