I Married a Witch is a 1942 fantasy romantic comedy film, directed by René Clair, and starring Veronica Lake as a witch whose plan for revenge goes comically awry, with Fredric March as her foil. The film also features Robert Benchley, Susan Hayward and Cecil Kellaway. The screenplay by Robert Pirosh and Marc Connelly and uncredited other writers, including Dalton Trumbo, is based on the novel The Passionate Witch by Thorne Smith, who died before he could finish it; it was completed by Norman H. Matson and published in 1941.