Spencer is a city in Roane County, West Virginia, United States. The population was 2,322 at the 2010 census. It is the county seat of Roane County. Spencer is the home of the annual West Virginia Black Walnut Festival. Points of interest include Charles Fork Lake, Chrystal Water and Power Company-Spencer Water and Ice Company, the McIntosh Mansion, and the Robey Theatre. Spencer is named for Spencer Roane, an early judge on the Virginia Supreme Court of Appeals.