David Jude Heyworth Law (born 29 December 1972) is an English actor. He has received nominations for two Academy Awards, two Screen Actors Guild Awards, four Golden Globe Awards, and two British Academy Awards, winning one. In 2007, he received an Honorary César and was named a knight of the Order of Arts and Letters by the French government, in recognition of his contribution to World Cinema Arts.

Law came to international attention for his role in Anthony Minghella's The Talented Mr. Ripley (1999), for which he won the BAFTA Award for Best Actor in a Supporting Role and was nominated for the Golden Globe Award and the Academy Award for Best Supporting Actor. In 2004, he received Academy Award, Golden Globe Award and British Academy Film Award nominations for his role in Anthony Minghella's epic war film Cold Mountain (2003). Law's other notable films include Gattaca (1997), Enemy at the Gates (2001), Steven Spielberg's A.I. Artificial Intelligence (2001), Road to Perdition (2002), Alfie (2004), Mike Nichols' Closer (2004), I Heart Huckabees (2004), The Holiday (2006), Repo Men (2010), Contagion (2011), Martin Scorsese's Hugo (2011), Joe Wright's Anna Karenina (2012), Steven Soderbergh's Side Effects (2013), Wes Anderson's The Grand Budapest Hotel (2014) and Paul Feig's Spy (2015). He also portrayed Dr. Watson in Guy Ritchie's Sherlock Holmes (2009) and Sherlock Holmes: A Game of Shadows (2011). In 2017, he portrayed the fictional Pope Pius XIII in the HBO drama miniseries The Young Pope. Law has been cast as Albus Dumbledore in the Fantastic Beasts film series, and as Walter Lawson / Mar-Vell in the 2019 Marvel Studios film Captain Marvel.

Law has also had an accomplished career on stage, and has received nominations for three Laurence Olivier Awards and two Tony Awards. He has performed in several West End and Broadway productions.