James Glennon, ASC (29 August 1942 in Los Angeles, California – 19 October 2006) was an American cinematographer who started off working in the Warner Bros. mail room, moved to the camera department and later worked as a cinematographer on feature motion pictures including as Director of Photography of the American unit for Return of the Jedi, Citizen Ruth, Election, About Schmidt and others including El Norte.
In 2005 his work on the HBO television series Deadwood, earned him an Emmy Award. Glennon also worked as Director of Photography on a number of other television movies and program series, such as The West Wing, along with Carnivàle and Big Love for HBO.
His father was cinematographer Bert Glennon. He had four children: Meghan Glennon (actress), Allison Glennon, Andrew Glennon, and Juliet Glennon.
He is buried at the Santa Barbara Cemetery.