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Oona Castilla Chaplin (born 4 June 1986) is a Spanish actress, dancer and ballerina. Born in Madrid, Spain, she also grew up in Switzerland. From the age of 15 she attended Gordonstoun School in Scotland and later attended RADA in London. Chaplin's parents are British-American actress Geraldine Chaplin and Chilean cinematographer Patricio Castilla. Her namesake is her maternal grandmother Oona O'Neill, Irish American playwright Eugene O'Neill's only daughter and British comedian and filmmaker Charlie Chaplin's fourth wife.[1]

Her first screen appearances was on the British drama series Spooks in 2007. She had a minor part in the James Bond movie Quantum of Solace. Most recently she had a recurring role as upper class housewife turned TV cooking show host Marnie Madden on the BBC drama series The Hour, and she appears in the BBC series Sherlock as John Watson's girlfriend Jeanette.

She is currently starring the BBC/FX period drama series Taboo, along with her Game of Thrones co-stars Jonathan Pryce, Nicholas Blane, Jefferson Hall, Roger Ashton-Griffiths, and Mark Gatiss.

In an interview with The Daily Telegraph that was published on August 11, 2011, Chaplin confirmed she had secured a role in the second season.[2] This was later suggested to be Jeyne Westerling.[3] She joined the cast as a guest star in the second season. However, her character introduces herself as Talisa Maegyr rather than Jeyne when she first appears in "Garden of Bones."[4] It was later revealed that the original plan had been for Chaplin to play Jeyne, but the character was dramatically changed in rewrites. Eventually George R.R. Martin himself suggested renaming her and came up with her character's new name.

Chaplin has described herself as a "massive fan" of both Game of Thrones as well as the A Song of Ice and Fire book series prior to her own casting.