John Robert Leonetti (born July 4, 1956 in California) A.S.C. is an American cinematographer and film director. He is most well known for his collaborative work with director James Wan, with whom he has acted as cinematographer on five films.

Leonetti began his career as a teenager working for his family's motion picture equipment business that was started by his father Frank Leonetti, known for his gaffing work on films such as The Wizard of Oz and Singin' in the Rain. He is the younger brother of cinematographer Matthew F. Leonetti, who was the cinematographer for John's first feature-length directorial effort, Mortal Kombat: Annihilation.