The Laughing Whitefish River (not to be confused with the Whitefish River) is a 19.4-mile-long (31.2 km) stream located on the Upper Peninsula of the U.S. state of Michigan. The river rises in eastern Marquette County and flows east and then north through Alger County to its mouth on Lake Superior at 46°31′30″N 87°01′43″W / 46.52500°N 87.02861°W a few miles north of Deerton, Michigan. The total watershed of the Laughing Whitefish River is 36 square miles (93 km2).