Lejaren Hiller (1880–1969), born John Arthur Hiller, was an American illustrator and photographer.

Trained in commercial art, he became known for highly staged photographs and illustrations that combined photography with elaborate constructed scenes. He worked for magazines, advertising clients and book publishers, often producing dramatic images suited to popular fiction and public campaigns. Hiller’s early magazine work included Life, while later assignments included detective pulp covers and World War II posters. He also created historical and medical imagery, including work related to the history of surgery.