Bob Gruen (born 1945) is an American photographer known for his rock 'n' roll photographs. Gruen was born in New York City. He began photographing rock stars with Bob Dylan and served as John Lennon's personal photographer during his time in New York City. Gruen is best known for his photograph of Lennon wearing a New York City T-shirt.
Other notable celebrities and rock bands photographed by Gruen include Eric Clapton, Jerry Garcia, Led Zeppelin, Sean Lennon, Yoko Ono, Joe Strummer, The Who, and lately Green Day.