Cedar River National Grassland is a National Grassland located in Sioux County and Grant County in southern North Dakota, United States.

[2] The portion in Sioux County lies within the Standing Rock Indian Reservation.

Within the grassland are topographic features such as level plains and rolling hills.

There are local ranger district offices (shared with Grand River National Grassland) in Lemmon, South Dakota.

This article related to a protected area in North Dakota is a stub.