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- OEA Research (Firm),
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- Officina Baueriana
- Officina Birckmannica,
- Officina Elzeviriana.
- Officina Hartmanniana,
- Officina Henricpetrina.
- Officina Langenhemii,
- Officina Plantiniana Raphelengii.
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- Ogata, Kōrin, 1658-1716
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- Ogawa, K.
- Ogawa, Kazuo
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- Ogawa, Minori.
- Ogawa, Mizuho
- Ogawa, Ryo
- Ogawa, Yujiro
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- Ogden Nurseries.
- Ogden, C. K. (Charles Kay), 1889-1957
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- Ogden, Colin Gerald
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- Ogden, Eugene Cecil.
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- Ogden, James.
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- Oggero, Antonia Josefina
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- Ogielska, Maria
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- Ogilby, J. Douglas (James Douglas), 1853-1925
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- Ogilby, William 1805-1873
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- Ogilvie, Ian S.
- Ogilvie, James.
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- Ogilvie‐grant., W R
- Ogilvy, Arthur James
- Ogilvy, Christopher S
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