Ralph Hubert "Sonny" Barger is a founding member (1957) of the Oakland, California, U.S. chapter of Hells Angels.

Barger was one of the Hells Angels present at the The Rolling Stones' Altamont Free Concert in 1969. He is also famous for his appearance in Hunter S. Thompson's widely read account of life within the club, Hell's Angels: The Strange and Terrible Saga of the Outlaw Motorcycle Gangs.

Sonny Barger is also the author of four books: Hell's Angel: The Life and Times of Sonny Barger and the Hell's Angels Motorcycle Club, Freedom: Credos from the Road, Dead in 5 Heartbeats and 6 Chambers, 1 Bullet. He was editor for the book Ridin' High, Livin' Free. Barger has appeared as an extra in the films Hells Angels on Wheels and Hell's Angels '69.