Knife River (Missouri tributary)

General data
- Name: Knife River (Missouri tributary)
- Water system: Missouri River
- Water type: River
- Progression: Missouri River -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
The Knife River is a tributary of the Missouri River, approximately 120 mi (193 km) long, in North Dakota in the United States. Knife is an English translation of the Native American name. It rises in west central North Dakota, in the Killdeer Mountains in Dunn County. It flows east, and is joined by Spring Creek near Beulah. It joins the Missouri north of Stanton, at the Knife River Indian Villages National Historic Site.