Clearwater County is a municipal district in west central Alberta, Canada in Division No. 9. Its northwest boundary is the Brazeau River. The municipal office is located in the Town of Rocky Mountain House. The county has a land area of 18,691.65 km² (7,216.89 sq mi) and comprises close to 99 percent of Census Division No. 9's land area of 18,921.38 km² (7,305.59 sq mi). Although the territory excluded is rather small in geographical area, it comprises the major population centre of Rocky Mountain House, which has one-third of Division No. 9's population, in addition to the communities of Caroline, Burnstick Lake and three Indian reserves. The county's 2006 census population was 11,826 inhabitants.
On July 1, 2000, the name was changed from "Municipal District of Clearwater No. 99" to "Clearwater County".