Watson mimiti karirna di panggung jeung ngagabung jeung Royal Shakespeare Company dina taun 1992. Dina taun 2002, manéhna dibéntangan dina produksi Twelfth Night jeung Uncle Vanya di Donmar Warehouse, sarta dicalonkeun pikeun Olivier Award 2003 pikeun Aktris Pangalusna. Film-film séjénna kaasup 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) jeung Kingsman: The Golden Circle (2017).
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