Octagon Building

• Andrew Gildersleeve Octagonal Building
• Armenian church architecture
• City Hall (University City, Missouri)
• List of octagonal buildings and structures
• List of octagonal buildings and structures in the United States
• Octagon Building (Santa Cruz, California)
• Octagon barn (disambiguation)
• Octagon house
• Octagonal Schoolhouse (disambiguation)
• Octagonal churches in Norway
• Round barn
• The Octagon (Roosevelt Island, New York)
• The Octagon House
• UCL Main Building
• World Cotton Centennial