Diana is a 2013 biographical drama film directed by Oliver Hirschbiegel and written by Stephen Jeffreys. Naomi Watts stars as Diana, Princess of Wales, with Naveen Andrews, Douglas Hodge, and Geraldine James in supporting roles.

Based on Kate Snell's 2001 book Diana: Her Last Love, the film focuses on the final two years of Diana's life, particularly her secret relationship with heart surgeon Hasnat Khan.

Diana had its world premiere in London on 5 September 2013 and was released in the UK on 20 September 2013. The film received overwhelmingly negative reviews from critics upon release, with sharp criticism for its direction, screenplay, and Watts' portrayal of the late Princess. It performed relatively well at the box office, grossing $21.7 million worldwide against a budget of $15 million.