The Fobes Octagon Barn is a historic building located south of Lanesboro, Iowa, United States.

It was built in 1883, and at the time of its nomination it was one of 14 octagon-shaped barns from the 19th-century left in Iowa.

[2] The barn has a diameter of 66 feet (20 m) and features a stone foundation, and a hip roof with a square cupola on top.

[2] The general purpose barn has two granaries, horse stalls, and the rest of the space is open for agricultural machinery.

This article about a property in Carroll County, Iowa on the National Register of Historic Places is a stub.