Spencer is a city in and the county seat of Roane County, West Virginia, United States. Originally known as "California," Spencer was chartered in 1858, and named after Spencer Roane, a distinguished jurist from Virginia, who served on the Virginia Supreme Court of Appeals, and for whom Roane County was named. The population was 2,062 at the 2020 census. Spencer is the home of the annual West Virginia Black Walnut Festival.