Topzle Updated: Wikipedia source
Thomas Cullen (born 17 July 1985) is a Welsh actor and director. He had roles in the independent film Weekend (2011), as Anthony Foyle, Viscount Gillingham in the television series Downton Abbey, and as Sir Landry in the historical drama series Knightfall. He also appeared in another historical drama playing the role of Thomas Seymour in Becoming Elizabeth.
| Year | Title | Role | Notes |
| 2006 | Daddy's Girl | Boy (Jason) | title: Cravings |
| 2008 | Watch Me | Tom | Short filmNominated for BAFTA Cymru Best Short Film |
| 2009 | Twenty Questions | Adam | Short film |
| 2010 | Balance | Nico | Short film |
| 2011 | Weekend | Russell | British Independent Film Award for Best Newcomer |
| 2012 | Henry | Henry | Short film |
| 2013 | Room 8 | Ives | Short filmBAFTA Award for Best British Short Film |
| The Last Days on Mars | Richard Harrington | ||
| 2014 | Desert Dancer | Ardavan | |
| 2015 | Black Mountain Poets | Richard | |
| The Batsman and the Ballerina | Simon | Short film | |
| 2016 | The Other Half | Nickie | Also executive producer |
| Happily Ever After | Colin | ||
| 100 Streets | Jake | ||
| Mine | Tommy Madison | ||
| Trial | Ryan / New Aaron | Short film | |
| 2018 | Souls of Totality | Guy 3 | Short film |
| 2019 | Pink Wall | Chris | Also writer, director and co-producer |
| Castle in the Ground | Jimmy | ||
| 2021 | Zebra Girl | Dan | |
| My Son | Frank | ||
| Barbarians | Lucas | ||
| 2023 | My Happy Ending | Dr. Hanson |
| Year | Title | Role | Notes |
| 2010 | Pen Talar | Richard | Episodes 7 & 8 |
| Banged Up Abroad | Yoram | Series 5; 1 episode | |
| 2011 | Black Mirror | Jonas | Series 1; episode 3: "The Entire History of You" |
| 2012 | World Without End | Wulfric | Mini-series; episodes 1–8 |
| 2013–2014 | Downton Abbey | Anthony Gillingham | Series 4 & 5; 12 episodes |
| 2015 | The Trials of Jimmy Rose | Joe Rose | Mini-series; episodes 1–3 |
| 2016 | The Five | Mark Wells | Mini-series; episodes 1–10 |
| 2017 | Orphan Black | Leonard Sipp | Season 5; episode 6: "Manacled Slim Wrists" |
| Gunpowder | Guy Fawkes | Mini-series; episodes 1–3 | |
| 2017–2019 | Knightfall | Landry du Lauzon | Lead role. Seasons 1 & 2; 18 episodes |
| 2018 | Genius | Luc Simon | Season 2; episodes 6 & 10: "Picasso: Chapters Six and Ten" |
| 2021 | Invasion | Mr. Edwards | Season 1; episodes 2–4 |
| 2022 | Becoming Elizabeth | Thomas Seymour | Episodes 1–6 & 8 |
| 2023–2025 | The Gold | John Palmer | Series 1 & 2; 12 episodes |
| 2024 | The Way | Jack Price MP | Episode 1: "The War" |
| Insomnia | Robert Averill | Episodes 1–6 | |
| 2025 | Mudtown | Peter Burton | Main cast |
| Trespasses | Michael Agnew | Main cast |
| Year | Award | Category | Work | Result |
| 2011 | London Film Critics Circle Awards | British Actor of the Year | Weekend | Nominated |
| BFI London Film Festival | Best British Newcomer | Nominated | ||
| Nashville Film Festival | Best Actor in a Narrative Feature | Won | ||
| British Independent Film Award | Most Promising Newcomer | Won | ||
| 2016 | Screen Actors Guild Award | Outstanding Performance by an Ensemble in a Drama Series | Downton Abbey | Won |