Oona Castilla Chaplin (; born 4 June 1986) is an actress. Her roles include Talisa Maegyr in the HBO TV series Game of Thrones, Kitty Trevelyan in the BBC drama The Crimson Field, Zilpha Geary in the series Taboo, and Varang in the Avatar film series.
Growing up, Chaplin spent time in Spain, the United Kingdom, Switzerland and Cuba. She travelled often because of her mother's film career. She started dancing ballet, salsa and flamenco at an early age.
When Chaplin was 15, she began studying at Gordonstoun School in Scotland on a drama scholarship. She appeared in several school plays; toured the United Kingdom in an adaptation of Romeo and Juliet; and impersonated her grandfather in the role of Bottom in an adaptation of A Midsummer Night's Dream at the Edinburgh Festival Fringe. After leaving Gordonstoun, she was accepted into the Royal Academy of Dramatic Art (RADA) in London, where she graduated in 2007.
She starred as Zilpha Geary in the eight-part historical fiction series Taboo (2017) on BBC One and FX. In 2024, she presented the BBC radio documentary Hollywood Exiles, which covered her grandfather's blacklisting by the House Un-American Activities Committee.
In 2025, Chaplin co-starred in , directed by James Cameron, as the villainous Varang. On casting the relatively unknown Chaplin, Cameron explained: "There was something Chaplin just locked into. There’s a sexuality; there’s a dominating psychology, and there’s a lot of fury. There are a lot of layers to what she’s doing there and the forces that are driving her. Oona was able to move fluidly back and forth between those in a way that I wasn’t seeing with the others." James Cameron Picked Oona Chaplin Over Three Big Stars for ‘Avatar: Fire and Ash’ Villain
| 2008 | Inconceivable | Laura Chappel | |
| First, Love? | Laura – Flower Girl | Short film | |
| Quantum of Solace | Perla de las Dunas receptionist | ||
| 2009 | Imago Mortis | Arianna | |
| Pelican Blood | Linda | ||
| 2010 | High and Dry | Sandra | Short film |
| Vampyre compendium | Short film | ||
| 2011 | ¿Para qué sirve un oso? | Rosa | |
| Beauty | |||
| Salar | Sandra | Short film | |
| 2012 | The Sorrows | Sarah | |
| 2013 | Powder Room | Jess | |
| What if... | Julianne | ||
| 2014 | Purgatorio | Marta | |
| Aloft | Alice | ||
| 2015 | The Longest Ride | Ruth Levinson | |
| Dancing for my Havana | Rosa | ||
| 2016 | Realive | Naomi | |
| 2017 | Anchor and Hope | Eva | |
| 2020 | Epicentro | Herself | Documentary |
| 2022 | Lullaby | Rachel Brown | |
| 2025 | Varang |
| 2007 | Spooks | Kate | Episode: "The Virus (Part 2)" |
| 2008 | Episode 2 | ||
| 2009 | Married Single Other | Fabiana | 3 episodes |
| 2010 | El Gordo: Una historia verdadera | Silvia | 2 episodes |
| 2011–2012 | Marnie Madden | 12 episodes | |
| 2012 | Sherlock | Jeanette | Episode: "A Scandal in Belgravia" |
| 2012–2013 | Game of Thrones | Talisa Maegyr | 11 episodes |
| 2013 | Dates | Mia | 5 episodes |
| 2014 | Inside No. 9 | Sabrina | Episode: "A Quiet Night In" |
| The Crimson Field | Kitty Trevelyan | Main role, 6 episodes | |
| Black Mirror | Greta | Feature-length special: "White Christmas" | |
| 2016 | El padre de Caín | Mercedes | |
| 2017 | Taboo | Zilpha Geary | Main cast, 8 episodes |
| 2018 | My Dinner with Hervé | Katie | Television film |
| 2020 | The Comey Rule | Lisa Page | Miniseries |
| 2022 | Made for Love | Alice | Episode: "Alice? Are You Listening?" |
| Treason | Maddy De Costa | Main cast, 5 episodes |
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