The Marion County Courthouse is a Beaux-Arts style building in Fairmont, West Virginia, in the United States. The courthouse was constructed from 1897 to 1900, and was designed by the architectural firm of Yost & Packard of Columbus, Ohio. Its dome is topped by a figure carrying the scales of justice. The courthouse, located at the intersection of Adams and Jefferson Streets in downtown Fairmont, and the adjacent American Foursquare-style sheriff's residence, were jointly added to the National Register of Historic Places in 1979 for their architectural, artistic and governmental significance.