Octagon is an unincorporated community in Marengo County, Alabama, United States.

[1] Octagon had a post office at one time, but it no longer exists.

The first building for this church was an octagonal structure, built by George Washington Barkley and his sons after the American Civil War.

[3] At one time the community also had a Methodist church, a two-story school, general store, cotton gin, and grist mill.

This Marengo County, Alabama state location article is a stub.