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- Orion
- Orion and Orus
- Oriskany
- Orissa
- Oristano
- Oriya
- Orizaba (volcano)
- Orizaba (city)
- Orkhon Inscriptions
- Orkney, Earl of
- Orkney, Elizabeth Hamilton, Countess of
- Orkney, George Hamilton, Earl of
- Orkney Islands
- Orléanais
- Orleanists
- Orleans, Dukes of
- Orléans, Charles, Duke of
- Orleans, Ferdinand Philip Louis Charles Henry, Duke of
- Orleans, Henri, Prince of
- Orleans, Henrietta, Duchess of
- Orleans, Jean Baptiste Gaston, Duke of
- Orleans, Louis, Duke of (1372-1407)
- Orleans, Louis, Duke of (1703-1752)
- Orleans, Louis Philippe, Duke of
- Orleans, Louis Philippe Joseph, Duke of
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- Orleans, Louis Philippe Robert, Duke of
- Orleans, Philip I., Duke of
- Orleans, Philip II., Duke of
- Orleans
- Orley, Bernard van
- Orlov
- Orm
- Ormazd
- Orme, Robert
- Ormerod, Eleanor A.
- Ormoc
- Ormolu
- Ormond
- Ormonde, Earl and Marquess of
- Ormonde, James Butler, 1st Duke of
- Ormonde, James Butler, 2nd Duke of
- Ormskirk
- Ornament
- Orne
- Ornithology
- Orodes
- Orography
- Orontes
- Oropus
- Orosius, Paulus
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