William Doolin was an American bandit outlaw and founder of the Wild Bunch, sometimes known as the Doolin-Dalton Gang. Like the earlier Dalton Gang alone, it specialized in robbing banks, trains, and stagecoaches in Arkansas, Kansas, Indiana, and Oklahoma during the 1890s.

The Wild Bunch, also known as the Doolin–Dalton Gang, or the Oklahombres, were a gang of American outlaws based in the Indian Territory in the late 19th and early 20th centuries. They were active in Kansas, Missouri, Arkansas, and Oklahoma Territory during the 1890s—robbing banks and stores, holding up trains, and killing lawmen. They were also known as The Oklahoma Long Riders because of the long dusters that they wore.