Beaver County is a county located in the U.S. state of Oklahoma. As of the 2020 census, the population was 5,049. The county seat is Beaver. The name was given because of the presence of many beaver dams on the Beaver River, which runs through the area. It is located in the Oklahoma Panhandle.

The Oklahoma Panhandle is a salient in the extreme northwestern region of the U.S. state of Oklahoma, consisting of Cimarron County, Texas County and Beaver County, from west to east. As with other salients in the United States, its name comes from the similarity of its shape to the handle of a pan. Its largest city is Guymon in Texas County. Black Mesa State Park, located in Cimarron County, is the highest point in the state. Other points of interest include Beaver Dunes Park, Optima Lake, and the Optima National Wildlife Refuge. Oklahoma Panhandle State University is ten miles away from Guymon.