Washington County Historical Society may refer to:

Washington County Historical Association, an organization based in Fort Calhoun, Nebraska, United States Washington County Historical Society, an organization in Florida, United States Washington County Historical Society, an organization in Ohio, United States Washington County Historical Society, an organization in Minnesota, United States Washington County Historical Society (Utah), an organization based in St. George, Utah, United States Washington County Historical Society, an organization in Wisconsin United States Washington County Historical Society in Fayetteville, Arkansas

See also List of historical societies