Under Capricorn (1949) is an Alfred Hitchcock film based on a novel by Helen Simpson, with screenplay written by James Bridie, and adaptation by Hume Cronyn. The movie was co-produced by Hitchcock and Sidney Bernstein for their short-lived production company Transatlantic Pictures and released through Warner Bros. The film starred Ingrid Bergman, Joseph Cotten, Michael Wilding, and Margaret Leighton.

The film was Hitchcock’s second film in Technicolor and uses ten-minute takes similar to those in Hitchcock’s film Rope (1948). It is believed that the audience thought Under Capricorn was going to be a thriller, which it was not — it was a domestic love triangle with a few thriller elements thrown in — which apparently led to its box office failure. However, the public reception of the film may not have been helped by the revelation in 1949 of Bergman’s illicit relationship with, and subsequent pregnancy by, Italian film director Roberto Rossellini.