The John W. Young Round Barn is an historic building located near Traer in rural Tama County, Iowa, United States. It was built in 1917 by Joe Seda as a general purpose barn. The building is a true round barn that measures in diameter. The structure is constructed in clay tile and features a two-pitch roof and an central silo that is high. It has been listed on the National Register of Historic Places since 1986.