Rosamund Mary Ellen Pike (born 1979) is a British actress and producer. Known for her portrayals of complex and morally ambiguous women in independent cinema and psychological thrillers, her accolades include a Primetime Emmy Award, a Golden Globe Award and a Laurence Olivier Award, in addition to nominations for an Academy Award and two BAFTAs.

A graduate of Wadham College, Oxford, Pike drew early recognition from her work in stage productions, including Romeo and Juliet at the National Youth Theatre, before her professional debut as Bond girl Miranda Frost in Die Another Day (2002). Supporting roles in the period dramas Pride & Prejudice (2005), An Education (2009) and Made in Dagenham (2010) were followed by further mainstream film credits including Johnny English Reborn (2011),  Wrath of the Titans (2012), Jack Reacher (2012) and The World's End (2013). For her portrayal of Amy Dunne in the psychological thriller Gone Girl (2014), Pike earned a nomination for the Academy Award for Best Actress.