The Little Muddy River is a tributary of the Missouri River, approximately 45 miles (72 km) long, in northwestern North Dakota in the United States.
It rises in the prairie country of northern Williams County and flows west, then south, joining the Missouri near Williston.
- ^ "Little Muddy River". Geographic Names Information System. United States Geological Survey. Retrieved 2014-01-01.
48°08′07″N 103°35′32″W / 48.13527778°N 103.59222222°W