Rapid River is an unincorporated community in Masonville Township, Delta County in the U.S. state of Michigan. It is situated on the northern end of the Little Bay de Noc between the mouths of the Tacoosh and Rapid rivers with the mouth of the Whitefish River just to the east. U.S. Highway 2 passes through Rapid River and joins with US 41 just west of town; the two then run concurrently from Rapid River south to Escanaba.