List of octagonal buildings and structures in the United States

Octagonal buildings and structures are characterized by an octagonal plan form, whether a perfect geometric octagon or a regular eight-sided polygon with approximately equal sides.

when the Tower of the Winds in Athens, Greece, was constructed.

Octagonal houses were popularized in the United States in the mid-19th century by Orson Squire Fowler and many other octagonal buildings and structures soon followed.

Octagonal buildings and structures in the United States, not including octagonal houses (which are covered at List of octagon houses) include the following.

Many of these are on the National Register of Historic Places.