Emily Margaret Watson, OBE (born 14 January 1967) is an English actress. She was nominated for the Academy Award for Best Actress for her debut film role as Bess McNeil in Lars von Trier's Breaking the Waves (1996) and for her role as Jacqueline du Pré in Hilary and Jackie (1998), winning the BIFA Award for Best Actress for the latter. She won the BAFTA TV Award for Best Actress for playing Janet Leach in the 2011 ITV television biopic Appropriate Adult.

Watson began her career on stage and joined the Royal Shakespeare Company in 1992. In 2002, she starred in productions of Twelfth Night and Uncle Vanya at the Donmar Warehouse, and was nominated for the 2003 Olivier Award for Best Actress for the latter. Her other films include The Boxer (1997), Angela's Ashes (1999), Gosford Park (2001), Punch-Drunk Love (2002), Red Dragon (2002), The Life and Death of Peter Sellers (2004), Corpse Bride (2005), Miss Potter (2006), Synecdoche, New York (2008), Oranges and Sunshine (2010), War Horse (2011), The Theory of Everything (2014) and Kingsman: The Golden Circle (2017).