Robert Emett (Bob) Seidemann (December 28, 1941 – November 27, 2017 ) was an American graphic artist and photographer.
Seidemann was born in Manhattan, New York, and grew up in Queens. He graduated from Manhattan High School of Aviation Trades and apprenticed with photographer Tom Caravaglia in NYC before heading west to San Francisco. There he found friends among the artists in North Beach and environs and began working as an artist himself. He collaborated with friends David Getz, Rick Griffin, Stanley Mouse and Alton Kelly, Big Brother and the Holding Company, George Hunter, The Charlatans, Janis Joplin and the Grateful Dead to create photographic images at the forefront of the popular and revolutionary culture of the time.