Oona Castilla Chaplin (born 4 June 1986) is a Spanish-British actress. Her roles include Talisa Maegyr in the HBO TV series "Game of Thrones", Kitty Trevelyan in the BBC drama "The Crimson Field", and Zilpha Geary in the series "Taboo".

A member of the Chaplin family, she is the daughter of actress Geraldine Chaplin, and is the granddaughter of the English filmmaker and actor Charlie Chaplin, as well as the great-granddaughter of the American playwright Eugene O'Neill. She was named after her maternal grandmother Oona O'Neill, Charlie Chaplin’s fourth and final wife.

When Chaplin was 15, she began studying at Gordonstoun School in Scotland on a drama scholarship. During her time there, she appeared in several school plays and toured the United Kingdom in an adaptation of "Romeo and Juliet" and impersonating her grandfather in the role of Bottom in an adaptation of "A Midsummer Night's Dream", which was performed at the Edinburgh Festival Fringe. After leaving Gordonstoun, she was accepted into the Royal Academy of Dramatic Art in London, from which she graduated in 2007.

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