| Movie | 2005 | The Adventures of Greyfriars Bobby | Coconut Tam | |
| Movie | 2023 | Blackadder: A Cunning Story | Self – Contributor | |
| Movie | 2013 | Dermot Morgan - Fearless Funnyman | Self | |
| Movie | 2022 | Ardal O'Hanlon: Tomb Raider | Self - Presenter | |
| Movie | 2023 | The Ghastly Ghoul | Gary | |
| Movie | 1997 | Ardal O'Hanlon - Live from Dublin's Gaiety Theatre | | |
| Movie | 2002 | Robbie the Reindeer: Legend of the Lost Tribe | Robbie (voice) | |
| Movie | 1999 | Robbie the Reindeer: Hooves of Fire | Robbie the Reindeer (voice) | |
| Movie | 2007 | Robbie the Reindeer in Close Encounters of the Herd Kind | Robbie (voice) | |
| Movie | 2024 | My Freaky Family | Nerlin Flood | |
| Movie | 2005 | Comic Aid | | |
| Movie | 2025 | Fran the Man | | |
| Movie | 2022 | Nazis, Treasures, and the Quest For Celts | Host | |
| Movie | 2011 | Small, Far Away: The World of Father Ted | | |
| Movie | 2017 | Handsome Devil | Donal Roche | |
| Movie | 2008 | Tales of the Riverbank | Hammy Hamster (voice) | |
| Movie | 2016 | Twice Shy | Brendan O'Meara | |
| Movie | 2016 | British Sitcom: 60 Years of Laughing at Ourselves | Father Dougal McGuire (archive footage) (uncredited) | |
| Movie | 2009 | Wide Open Spaces | Myles | |
| Movie | 1997 | Flying Saucer Rock 'n' Roll | Eddie Johnny | |
| Movie | 2019 | Border Country: When Ireland Was Divided | Himself | |
| Movie | 2004 | Stop! You're Killing Me | | |
| Movie | 1998 | The Butcher Boy | Mr Purcell | |
| Movie | 2007 | Ardal O'Hanlon - Live in Dublin | Himself | |
| Movie | 2019 | Showbands: How Ireland Learned to Party | Himself - Presenter | |
| Movie | 2024 | The Geneva Window: Through a Glass Darkly | Self - Presenter | |
| TV Show | 1993 | Shooting Stars | Self | 1 |
| TV Show | 2004 | Live at the Apollo | | 1 |
| TV Show | 2007 | Skins | Kieran | 2 |
| TV Show | 2000 | My Hero | George Sunday / Thermoman | 43 |
| TV Show | 2006 | The One Show | Self | 2 |
| TV Show | 1995 | Father Ted | Father Dougal McGuire | 24 |
| TV Show | 2005 | Blessed | | 8 |
| TV Show | 1999 | Big Bad World | | 16 |
| TV Show | N/A | The Stand Up Show | | 86 |
| TV Show | 2005 | Doctor Who | Brannigan | 1 |
| TV Show | 2014 | Lily's Driftwood Bay | Bull Dozer (voice) | 100 |
| TV Show | 2015 | After Hours | Peter Hannigan | 6 |
| TV Show | 2015 | Taskmaster | Self | 10 |
| TV Show | 2007 | The Graham Norton Show | Self | 1 |
| TV Show | 2014 | Alan Davies: As Yet Untitled | Self | 2 |
| TV Show | 2015 | Cucumber | Brian McCoy | 1 |
| TV Show | 2013 | London Irish | Da | 4 |
| TV Show | 2011 | Death in Paradise | Jack Mooney | 24 |
| TV Show | 2023 | The Woman in the Wall | Dara | 2 |
| TV Show | 2024 | Pitch Invasion: How the Scottish and Irish Changed Football | Self | 3 |
| TV Show | 2008 | Who Do You Think You Are? | Himself | 1 |
| TV Show | 2019 | Six Nations Sin Bin | Self | 1 |
| TV Show | 2022 | Rosie Molloy Gives Up Everything | Conall Molloy | 6 |
| TV Show | 1988 | Comic Relief | Father Dougal McGuire | 1 |
| TV Show | 2024 | The Emerald Isles with Ardal O'Hanlon | | 3 |
| TV Show | 2015 | Nelly & Nora | Dad | 52 |
| TV Show | 2023 | Extraordinary | Martin (voice) | 1 |
| TV Show | 2018 | Derry Girls | Eammon | 2 |
| TV Show | 2020 | Irish Pickers | Narrator | 7 |
| TV Show | 2016 | Ireland with Ardal O'Hanlon | Himself | 3 |
| TV Show | 2024 | Return to Paradise | DI Jack Mooney | 2 |
| TV Show | 2009 | Val Falvey, TD | Val Falvey | 6 |
| TV Show | 2018 | Celebrity Catchphrase | Self - Contestant | 1 |
| TV Show | 1998 | Parkinson | Self | 2 |
| TV Show | 1964 | Top of the Pops | Self - Host | 1 |
| TV Show | 2017 | Richard Osman's House of Games | Self - Panellist | 5 |
| TV Show | 1962 | The Late Late Show | Self | 1 |
| TV Show | 2025 | Six Nations Greatest Moments | Self | 6 |
| TV Show | 2025 | Sherlock & Daughter | Mr. Halligan | 8 |
