Williams River (Oregon)
 The Williams River is a tributary about 21 miles (34 km) long of the South Fork Coos River in the U.S. state of Oregon. Formed by the confluence of Lost Creek and Little Cow Creek it begins in western Douglas County near the Coos County line and flows generally northwest through the Southern Oregon Coast Range. In eastern Coos County it joins Tioga Creek to form the South Fork Coos River about 32 miles (51 km) from its confluence with the Millicoma River.