Filmography
| Year | Title | Role | Notes |
|---|---|---|---|
| 1999–2000 | The League of Gentlemen | Various characters | Series 1 and 2 Also co-creator and co-writer |
| 2001 | Spaced | Agent | |
| Randall & Hopkirk (Deceased) | Inspector Large | ||
| Birthday Girl | Porter | ||
| 2002 | The League of Gentlemen | Various characters | Series 3 Also co-creator and co-writer |
| 2003 | Nighty Night | Glenn Bulb | |
| Bright Young Things | Estate agent | ||
| 2004 | Sex Lives of the Potato Men | Jeremy | |
| Catterick | Peter | ||
| Agatha Christie's Marple | Ronald Hawes | Episode: "The Murder at the Vicarage" | |
| 2005 | Match Point | Ping pong player | |
| The Quatermass Experiment | John Patterson | ||
| Nighty Night | Glenn Bulb | ||
| Funland | Ambrose Chapfel | ||
| The League of Gentlemen's Apocalypse | Various characters Himself |
||
| 2006 | Fear of Fanny | Johnnie Cradock | |
| Starter for 10 | Bamber Gascoigne | ||
| 2007 | The Wind in the Willows | Ratty | |
| Doctor Who | Professor Lazarus | Episode: "The Lazarus Experiment" | |
| Jekyll | Robert Louis Stevenson | ||
| 2008 | Clone | Colonel Black | |
| Free Jimmy | Jakki | ||
| Psychoville | Jason Griffin | ||
| Crooked House | Curator | Also creator and writer | |
| 2009 | Agatha Christie's Poirot | Leonard Boynton | Episode: "Appointment with Death" |
| 2010 | Worried About the Boy | Malcolm MacLaren | |
| The First Men in the Moon | Professor Cavor | Also writer | |
| A History of Horror | Himself | Documentary Also writer |
|
| 2010–present | Sherlock | Mycroft Holmes | Also co-creator and writer of the episodes "The Hounds of Baskerville" and "The Great Game" |
| 2011 | Doctor Who | Gantok | Episode: "The Wedding of River Song" |
| The Infinite Monkey Cage | Himself | Episode: "The Science of Christmas" | |
| 2012 | Being Human | Mr. Snow | |
| Horrible Histories | As part of "The League of Gentlemen" |
Read more about this topic: Mark Gatiss