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- Oldman
- Olds
- olefin
- Olekma
- Olenek
- oleomargarine
- Olesha, Yuri
- oleum
- oligosaccharide
- Ólimbos
- Olinda
- Olisipo
- Oliva, Peace of
- Olivares, Gaspar de Guzmán, conde-duque de
- Oliver, Andrew
- Olivier, Isaac
- Olivier, Sydney Haldane Olivier, 1st Baron
- Ollivant, Alfred
- Ollivier, Émile
