Chaplin was born in Madrid to English-American actress Geraldine Chaplin and Chilean cinematographer Patricio Castilla.[2][3] She has a half-brother named Shane from her mother's previous relationship with film director Carlos Saura.[3] Her paternal grandmother, Hilda Valderrama, was a Mapuche human rights lawyer.[4] A member of the Chaplin family, she is a granddaughter of English filmmaker and actor Charlie Chaplin, and great-granddaughter of Irish-American playwright Eugene O'Neill.[5] She was named after her maternal grandmother Oona O'Neill, Charlie Chaplin's fourth and final wife.[citation needed]
Chaplin spent her childhood mostly in Spain, the United Kingdom, Switzerland and Cuba, but travelled often because of her mother's film career.[6][7] She started dancing ballet, salsa and flamenco at an early age.[7][8]
Since graduating from RADA, Chaplin has acted in mainly British and Spanish short and feature films. She has played alongside her mother in the feature films Inconceivable, ¿Para qué sirve un oso?, Imago Mortis and Anchor and Hope. She has also had supporting roles in British and American television. She appeared as a Brazilian cage dancer in ITV's Married Single Other (2010); as Marnie Madden, the wife of main character Hector Madden, in the BBC period drama The Hour (2011–2012); as John Watson's girlfriend in an episode of BBC's Sherlock (2012); and as Talisa Maegyr in HBO's Game of Thrones (2012–2013).
She plays Kitty Trevelyan, a lead character, in the BBC drama The Crimson Field (2014), and Ira Levinson's wife Ruth Levinson in The Longest Ride (2015).
Chaplin is a trustee of The Boa Foundation, an international organization that works with indigenous communities to regenerate degraded ecosystems and protect biodiversity.[15]
^Ross, David (28 April 2009). "Students step back in time to celebrate 75 years: Pupils and staff make it a special 1930s anniversary for Gordonstoun school". The Herald. p. 3.
^Thynne, Jane (30 July 2003). "Parents: Just like mum: Choosing the same career as a parent is very common – but not necessarily a good idea". The Guardian. p. 14.
