William Craig (1807, Greenbrier County, West Virginia – 1869, Idaho) was a frontiersman and trapper. Allegedly, he left home after killing a man in self-defense, and soon headed to the Pacific Northwest, probably with William Sublette and other fur traders. He also trapped with Jedediah Smith in the Blackfoot country until he joined Joe Walker's California Expedition of 1833–34.
In 1836, he and others established a trading post known as Fort Davy Crockett in Brown's Hole, Colorado. He acted as a guide to a missionary party to Fort Hall, Idaho and on the Whitman Mission near Walla Walla, Washington. He then established a farm near Lapwai, Idaho. Somewhere along the line, he married a Nez Perce woman and was friendly with the tribe. In 1856, he became the Indian Agent for the Cayuse tribe and occasionally scouted for the army. He died of a stroke in 1869.