The Risum Round Barn near Orfordville, Wisconsin, United States, is a round barn that was built during 1890–1892. It was listed on the National Register of Historic Places (NRHP) in 1979. Among round barns in Wisconsin, it is significant for its early date of construction. It is a 60-foot (18 m) diameter barn that was built for Carl Risum (1847–1899), an immigrant from Norway, built by a "carpenter named John Gansert or Gansell, according to oral tradition, but there is no record of the exact date or cost." Lumber to build the barn was brought from the railroad depot at Brodhead, Wisconsin, six miles away.