Also known as the Petty-Roberts-Beatty House, the Octagon House is a historic home in Clayton, Alabama. It was built in 1859 to 1861. Some folks say that this is the only surviving antebellum octagonal shaped house in the entire state of Alabama.

The Octagon House was built for Benjamin Franklin Petty. Petty was a New York native who moved to Clayton as one of its pioneers. He was a carriage and furniture merchant, a relatively wealthy man at his time. He got the idea of building such an oddly shaped house from the book ?A Home for All or the Gravel Wall and Octagon Mode of Building? by Orson S. Fowler. The Octagon House also served as a staff headquarters for General Benjamin H. Grierson, a Union Cavalry Commander during the Civil War.

In 1974, the Octagon House became a part of the National Register of Historic Places.