A Dangerous Method is a 2011 historical drama film directed by David Cronenberg. The film stars Keira Knightley, Viggo Mortensen, Michael Fassbender, Sarah Gadon, and Vincent Cassel. Its screenplay was adapted by writer Christopher Hampton from his 2002 stage play The Talking Cure, which was based on the 1993 non-fiction book by John Kerr, A Most Dangerous Method: The Story of Jung, Freud, and Sabina Spielrein.

Set in the period from 1902 to the eve of World War I, A Dangerous Method follows the turbulent relationships between Carl Jung, founder of analytical psychology, Sigmund Freud, founder of the discipline of psychoanalysis, and Sabina Spielrein, initially Jung's patient and later a physician and one of the first female psychoanalysts.

A co-production between British, Canadian, and German production companies, the film marks the third consecutive collaboration between Cronenberg and Viggo Mortensen (after A History of Violence and Eastern Promises). This is also the third Cronenberg film made with British film producer Jeremy Thomas, after they collaborated on the William Burroughs adaptation Naked Lunch and the J. G. Ballard adaptation Crash. Filming took place between May and July 2010 in Cologne on a soundstage, with exterior shots filmed in Vienna.

A Dangerous Method premiered at the 68th Venice Film Festival and was also featured at the 2011 Toronto International Film Festival. The film was theatrically released in Germany on 10 November 2011 by Universal Pictures International, in Canada on 13 January 2012 by Entertainment One and in the United Kingdom on 10 February 2012 by Lionsgate. The film grossed $24 million worldwide and received positive reviews from critics, many praising the performances of Mortensen and Fassbender and Cronenberg's direction. It appeared on several critics' year-end lists. At the 69th Golden Globe Awards, Mortensen was nominated for the Best Supporting Actor – Motion Picture.