- Olteanu Alexandru-Liviu
- Ouzzif Meryem
- Oularbi Mohamed Rabie
- Ordonez John Richard
- Onizawa Naoya
- Ouertani Karim
- Oikonomou George
- Oulmakhzoune Said
- Oulmakhzoune Said
- Oellers Michel
- Ollivier Benjamin
- Oriot Hélène
- Ortega Felipe
- Ouasli Faicel
- Oueslati Sameh
- Ouvradou Gérald
- Oberle Frank
- Odille F
- Ognard Julien
- Okamoto Satoru
- Olaszi Peter
- Olivier Christian
- Orgerie Anne-Cécile
- Ormrod Janet
- Ortiz Guzman John Erick
- Ouarraou Mohamed
- Ouattara F.
- Ouattara Frédéric Martial
- Oularbi Mohamed Rabie
- Ould Cheikh Mouhamedou Youssouf
- Ouy Julien
- Ouyang Junlin
- Ovejero-García Santiago
- Oyedapo Olufemi
- Obeegadoo Mervin
- Oborzyn ́ski Krzysztof
- Odet Christophe
- Ogor Robert
- Ohno Hideo
- Olivares Amaro Marisnel Carolina
- Olivier Christian
- Ollivier Benjamin
- Olvera Irigoyen Oscar
- Olvera Irigoyen Oscar
- Onana V.P.
- Onete Cristina
- Oquendo Maria
- Orda Ariel
- Oro Daniel
- Orozco Torrentera Julio Enrique
- Ortalo R.
- Ortega-Ruiz Jose A.
- Ortiz Guzman John Erick
- Orus-Perez Raul
- Osswald Christophe
- Otnes Roald
- Ouarda Wael
- Ouelha Samir
- Ouertani Karim
- Oularbi Mohamed Rabie
- Ould Cheikh Mouhamedou Youssouf
- Ould Mohamed Sidi
- Ourahmoune Amel
- Ourraou Mohamed
- Ouvradou Gwénaelle
- Ouya Ange
- Owezarski Philippe
- Oyen Wim J. G.
- Oyen Wim J.G