In architecture, a cupola // is a small, most often dome-like, structure on top of a building. Often used to provide a lookout or to admit light and air, it usually crowns a larger roof or dome.
The cupola is a development during the Renaissance of the oculus, an ancient device found in Roman architecture, but being weatherproof was superior for the wetter climates of northern Europe. The chhatri, seen in Indian architecture, fits the definition of a cupola when it is used atop a larger structure.
Cupolas often appear as small buildings in their own right. They often serve as a belfry, belvedere, or roof lantern above a main roof. In other cases they may crown a spire, tower, or turret.  Barns often have cupolas for ventilation.
Cupolas on the towers of Montefiascone Cathedral, Italy.
Cupolas were also used on some old barns for ventilation.
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- "Glossary of Architectural Terms - C". Archiseek: Online Architecture Resources. Retrieved 3 January 2009.
- "cupola". The American Heritage Dictionary of the English Language, Fifth Edition. Houghton Mifflin Harcourt Publishing Company. 2014. Retrieved 26 April 2015.
- "Just what is a cupola anyway?". Cupola Consulting. Retrieved 3 January 2009.
- In Italian cupola simply means dome, and the ornamental top element is called lanterna.
- "What is a cupola and why do barns have them?". Retrieved 15 November 2015.
- "Railroad Dictionary: A". CSX.com. CSX Transportation. Retrieved 18 September 2014.
- Zabel, Darcy (2005). The (Underground) Railroad in African American Literature. Peter Lang. p. 5. ISBN 9780820468167.
- Bradford, George. Axis Armored Fighting Vehicles: 1/72 Scale.