Little Thornapple River is a 5.8-mile-long (9.3 km) river in Barry County in the U.S. state of Michigan. The Little Thornapple rises from the outflow of Jordan Lake in north-central Woodland Township at 42°45′38″N 85°08′43″W / 42.76056°N 85.14528°W. The stream flows primarily to the southwest and empties into the Coldwater River in central Carlton Township at 42°42′50″N 85°13′41″W / 42.71389°N 85.22806°W. Lake Jordan is fed primarily by the outflow of Tupper Lake, which in turn is fed by Tupper Creek all in Odessa and Sebewa townships in Ionia County.