- O'Donnell Michael
- Obando-Posada Diana
- Oberlé Dominique
- Ocampo Aaron
- Ochoa Danielle
- Ochoa Danielle
- Oettingen Gabriele
- Ogbonnaya Chisom Esther
- Ogbonnaya Chisom Esther
- Oger Marie
- Oh Dong Won
- Ohno Sachiko
- Oikawa Haruka
- Oikawa Masanori
- Okan Ceylan
- Olanrewaju Adebayo Sulaiman
- Oldmeadow Julian A
- Olech Michał
- Oliveira Margareth da Silva
- Oliveira Raquel
- Oliveira Raquel
- Olivier Codou
- Ollierou Florian
- Olofsson Jonas K.
- Olofsson Jonas K.
- Olsen Jerome
- Ondet Marie
- Ong Chew Wei
- Ong Elsie
- Onie Sandersan
- Oosterlinck Marlies
- Oprea Ciobanu Raluca
- Ordoñez-Riaño Santiago
- Ori Dorottya
- Oris Michel
- Orjiakor Charles
- Orlić Ana
- Orosz Gábor
- Orri M.
- Orri Massimiliano
- Orthey Robin
- Ortiz Manuel S.
- Ortiz Manuel
- Ortiz María Victoria
- Osborne Randall
- Osenova Petya
- Osin Evgeny
- Osowiecka Malgorzata
- Ostermann Thomas
- Ostermann Thomas
- Otgaar H.
- Oudin-Doglioni Damien
- Ouerhani N.
- Ouherrou Nihal
- Ouherrou Nihal
- Ourabah M.
- Ourmi Mohammed El
- Overkott Clara
- Oviedo-Trespalacios Oscar
- Owsley Nicholas
- Ozery Daphna Hausman
- Očovaj Sanja Batić
- Očovaj Sanja Batić
- O’connor Emma
- O’donnell Susan
- O’mara Kunz Erin M