Heath Andrew Ledger (April 4, 1979 – January 22, 2008) was an Australian actor and music video director. After playing roles in several Australian television and film productions during the 1990s, Ledger moved to the United States in 1998 to develop his film career further. His work consisted of twenty films, including 10 Things I Hate About You (1999), The Patriot (2000), A Knight's Tale (2001), Monster's Ball (2001), Lords of Dogtown (2005), Brokeback Mountain (2005), Candy (2006), I'm Not There (2007), The Dark Knight (2008), and The Imaginarium of Doctor Parnassus (2009), the latter two being posthumous releases. He also produced and directed music videos and aspired to be a film director.

For his portrayal of Ennis Del Mar in Brokeback Mountain, Ledger won the New York Film Critics Circle Award for Best Actor and the Best International Actor Award from the Australian Film Institute; he was the first actor to win the latter award posthumously. He was nominated for the BAFTA Award, Screen Actors Guild Award, Golden Globe Award and the Academy Award for Best Actor, becoming the eighth-youngest nominee in the category at that time. Posthumously, he shared the 2007 Independent Spirit Robert Altman Award with the rest of the ensemble cast, the director, and the casting director for the film I'm Not There, which was inspired by the life and songs of American singer-songwriter Bob Dylan. In the film, Ledger portrayed a fictional actor named Robbie Clark, one of six characters embodying aspects of Dylan's life and persona.