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- O'Doherty Simon
- O'Hart F.
- O'Reilly Dermot
- Obeid Fadi
- Oberhauser Roy
- Obermann Stuart
- Obersteiner Michael
- Obit J.H.
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- Obligis Estelle
- Oborzyn ́ski Krzysztof
- Obrig Hellmuth
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- Olteanu Alexandru Liviu
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- Omar Mawloud
- Omar Mohd Azahadi
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- Omnes Benoît
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- Onizawa Naoya
- Onizuka Makoto
- Ono Lariane
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- Ortiz Guzman John Erick
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