When Tomorrow Dies is a Canadian drama film, directed by Larry Kent and released in 1965.^[1] The film stars Patricia Gage as Gwen James, a housewife trapped in an unfulfilling marriage to Doug (Douglas Campbell), who returns to university and embarks on an extramarital affair with her professor Patrick Trevelyan (Neil Dainard).^[2]

The film was shot in Vancouver, British Columbia, for a budget of $100,000, the largest budget Kent had worked with on any of his films to that time.^[3] It also marked his first time directing a screenplay that he had not written entirely on his own, as the film was written primarily by University of British Columbia creative writing professor Robert Harlow.^[4]

The film had its theatrical premiere on November 24, 1965 in Vancouver.^[2]

It was later screened at the 1984 Festival of Festivals as part of Front & Centre, a special retrospective program of artistically and culturally significant films from throughout the history of Canadian cinema.^[5] It was also part of a retrospective of Kent's films, alongside The Bitter Ash, Sweet Substitute and High, which screened at a number of venues in 2002 and 2003, including Cinematheque Ontario in Toronto, the Pacific Cinémathèque in Vancouver and the Canadian Film Institute in Ottawa.^[6]