William Francis "Grizzly Bill" Holcomb (27 January 1831 – 1909), was an American prospector and the first to discover gold in the region which became known as Holcomb Valley, near present-day Big Bear Lake, California. Holcomb Valley had the most gold of any Southern California field. The boomtown of Belleville grew up there and for a time was the third or fourth largest in Southern California. Holcomb was the first justice of the peace in Belleville and later was elected to county offices.