The film, based on a book from "L.A. Confidential" author James Ellroy and a real-life murder from the '40s, will be one of numerous films vying for the honor of winning the famed festival's Golden Lion award, the BBC reported.
Last year's Golden Lion winner was "Brokeback Mountain," which later earned a Best Film Academy Award nomination.
"Dahlia," which was directed by "Scarface" helmer Brian De Palma, features Johansson as a 1947 actress whose romantic life with actors Aaron Eckhart and Josh Hartnett's characters may have resulted in her murder.
The film is set to open the film festival on Aug. 30 and which runs until Sept. 9, the BBC said.