Stephenie McMillan, a set decorator who created the look of all eight Harry Potter films and won an Oscar for the 1996 romance “The English Patient,” died on Aug. 19 at her home in England. She was 71.

The cause was cancer, Stuart Craig, who worked with her on the Potter films, wrote in an article in The Guardian.

Ms. McMillan created sets that were opulent and cluttered, like Hogwarts Academy, or spare, like the bedroom in the bombed-out monastery where the protagonist of “The English Patient” lives. Both she and Mr. Craig, a production designer, received Oscars for their art direction and set decoration on “The English Patient,” an adaptation of the Michael Ondaatje novel. The film earned nine Academy Awards altogether, including for best picture.