Aaron Siskind (December 4, 1903 – February 8, 1991) was an American photographer. He is considered to be closely involved with, if not a part of, the abstract expressionist movement.
Siskind was a grade school English teacher in the New York Public School System for 25 years, and began photography when he received a camera for a wedding gift and began taking pictures on his honeymoon. Early in his career Siskind was a member of the New York Photo League, where he produced several significant socially conscious series of images in the 1930s, among them "Harlem Document".
Siskind's work focuses on the details of nature and architecture. He presents them as flat surfaces to create a new image which stands independent of the original subject. For some his work has been described as crossing the line between photography and painting, his photographs are works unique to the art form of photography.