Consumers' Cooperative of Berkeley, informally known as the Berkeley Co-op, or simply Co-op, was a consumers' cooperative based in Berkeley, California which operated from 1939 to 1988, when it collapsed due to internal governance disputes and bankruptcy. During its height, it was the largest cooperative of its kind in North America, with over 100,000 members, and its collapse has provoked intense discussion over how food cooperatives should be operated.