Emily Margaret Watson OBE (born 14 January 1967) is an English actress. She began her career on stage and joined the Royal Shakespeare Company in 1992. 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 British Independent Film Award for Best Actress for the latter.

Watson's other films include The Boxer (1997), Angela's Ashes (1999), Punch-Drunk Love (2002), Red Dragon (2002), Equilibrium (2002), The Life and Death of Peter Sellers (2004), Corpse Bride (2005), Miss Potter (2006), Synecdoche, New York (2008), The Theory of Everything (2014), Kingsman: The Golden Circle (2017), The Happy Prince (2018) and God's Creatures (2022). For her role in the HBO miniseries Chernobyl, she was nominated for a Primetime Emmy Award and a Golden Globe Award. She won the British Academy Television Award for Best Actress for playing Janet Leach in the 2011 ITV television biopic Appropriate Adult and was nominated for the International Emmy Award for Best Actress for the 2017 BBC miniseries Apple Tree Yard.