The Oglala National Grassland is a United States National Grassland in the northwest corner of Nebraska. It is in northern Sioux and northwestern Dawes counties, on the borders with South Dakota and Wyoming. It is 94,520 acres (38,250 ha) in size and is one of the small handful of National Grasslands administered by the US Department of Agriculture's Forest Service. It is managed by the U.S. Forest Service together with the Nebraska and Samuel R. McKelvie National Forests and the Buffalo Gap and Fort Pierre National Grasslands from common offices in Chadron, Nebraska.