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Jack Gleeson (born 20 May 1992) is an Irish actor. He is best known for portraying Joffrey Baratheon in the HBO television series Game of Thrones (2011–2014). Following this role, Gleeson took a six-year hiatus from screen acting. He returned to the screen in 2020 and has since appeared in the Irish film In the Land of Saints and Sinners (2023) and the series The Sandman (2025) and House of Guinness (2025).
| Year | Title | Role | Notes | Ref. |
| 2002 | Reign of Fire | Kid | Uncredited | |
| 2003 | Fishtale | Boy with fish | Short film | |
| 2004 | Tom Waits Made Me Cry | Young Vincent | ||
| Shaving the Baby | ||||
| 2005 | Batman Begins | Little Boy | ||
| 2007 | Shrooms | Lonely Twin | ||
| 2008 | We Are Munster | Short film | ||
| 2009 | A Shine of Rainbows | Seamus | ||
| 2010 | All Good Children | Dara | ||
| 2012 | Chat | Adam | Short film | |
| Electric Burma | Himself | Documentary | ||
| 2014 | Ringsend | Short film | ||
| 2021 | Rebecca's Boyfriend | Rory | ||
| 2023 | In the Land of Saints and Sinners | Kevin Lynch | ||
| 2025 | With Compliments from the Gentlemen Across the Bar in Oman | Himself | Short film | |
| Learners | Charlie | Voice, short film |
| Year | Title | Role | Notes | Ref. |
| 2011–2014 | Game of Thrones | Joffrey Baratheon | Main role (seasons 1–4) | |
| 2020 | Out of Her Mind | Casper | 2 episodes | |
| 2023 | Sex Education | Dodgy Mo | 2 episodes (season 4) | |
| 2023–2024 | The Famous Five | Thomas Wentworth | 3 episodes | |
| 2025 | Safe Harbor | Farrell Walsh | Main role | |
| The Sandman | Puck / Robin Goodfellow | 5 episodes (season 2) | ||
| House of Guinness | Byron Hedges | 6 episodes |
| Year | Title | Role | Venue | Notes | Ref. |
| 2002 | A Christmas Carol | Tiny Tim | Gate Theatre | ||
| 2007 | Great Expectations | Young Pip | |||
| DNA | Riverbank Arts Centre | ||||
| 2009 | The Giant Blue Hand | Timmy Time | The Ark | ||
| 2011 | Spurt | Various | Cork Midsummer Festival | ||
| 2012 | Monster/Clock | Toby | Smock Alley Theatre | Also associate producer | |
| 2013 | Distance from the Event | — | Dublin Fringe Festival | Associate producer | |
| Human Child | — | Smock Alley Theatre | Co-producer | ||
| 2014–2016 | Bears in Space | Nico/Skin | Project Arts Centre | ||
| Edinburgh Festival Fringe | |||||
| Smock Alley Theatre | |||||
| Soho Theatre | |||||
| 59E59 Theaters | |||||
| 2017 | The Water Orchard | — | Project Arts Centre | Dramaturg | |
| 2018 | Collapsing Horse Science Fiction Radio Hour | Performer | Set Theatre | Episodes: "Yokespiracy" & "The Irrational Number" | |
| The Sugar Club | |||||
| 2020–2022 | To Be a Machine (Version 1.0) | Mark O'Connell | Dublin Theatre Festival | ||
| Némo Bienniale Internationale | |||||
| Hong Kong Arts Festival | |||||
| 2021 | The Seagull | Constantine | Galway International Arts Festival | ||
| 2023 | To Be a Machine (Version 2.0) | Mark O'Connell | Dublin Theatre Festival |
| Award | Year | Category | Nominee / Work | Result | Ref. |
| 1st Irish Theatre Festival | 2016 | Special Jury Prize | Bears in Space | Won | |
| IGN Awards | 2011 | Best TV Villain | Game of Thrones | Nominated | |
| 2012 | Best TV Villain | Nominated | |||
| 2013 | Best TV Villain | Nominated | |||
| IGN People's Choice Awards | 2012 | Best TV Villain | Won | ||
| 2013 | Best TV Villain | Won | |||
| Portal Awards | 2012 | Best Young Actor | Nominated | ||
| Russian National Movie Awards | 2015 | Best Foreign Villain of the Year | Nominated | ||
| Saturn Awards | 2013 | Best Performance by a Younger Actor in a Television Series | Nominated | ||
| Scream Awards | 2011 | Best Ensemble | Nominated | ||
| Screen Actors Guild Awards | 2011 | Outstanding Performance by an Ensemble in a Drama Series | Nominated | ||
| 2013 | Nominated | ||||
| Young Hollywood Awards | 2014 | We Love to Hate You | Nominated |