William Oakland Round Barn
 The Ole Wibholm Round Barn is an historic structure located near Blairsburg in rural Hamilton County Iowa United States. It was built in 1910 and has been listed on the National Register of Historic Places since 1986. The true round barn measures 50 feet (15.2 m) around. It is constructed of clay tiles and features a conical roof aerator a small dormer on the west side and a larger one on the east side and a 16 foot (4.9 m) central silo.