- Oberhansli François
- Obota Clay
- O’brien Duncan A
- Obstler Jean Baptiste
- Obura David
- Occelli Nicolas
- Ochida Noé
- O’connor Olivia
- O'Connor Olivia
- Oddenyo Remy
- Oddenyo R.M.
- Odier Philippe
- Odin E.
- Odobel Charlène
- O’donnell J. L.
- Ody Denis
- Odzak N.
- Oedin Malik
- Oedin Malik
- Oedin Malik Soane Paul
- Oelgemöller M.
- Oelgemöller Michael
- O'Farrell Shay
- Ogès A.
- Ogès Audrey
- Ogorzaly Leslie
- Ohman M.-C.
- Ohte N.
- Oiglane-Slik E.
- Ojaveer Henn
- Ojea Elena
- Olagoke Adewole A.
- Olatunji Opeyemi Joshua
- Olds A. D.
- O'Leary Jennifer
- Oliveira K.
- Oliveira Paulo
- Oliveira Pedro H
- Oliveira Raul
- Olivier Frédéric
- Olivry Marion
- Ollier C.
- Ollier C
- Ollivier Bernard
- Olsen Steffen M.
- Olson Robert
- Ona-Nguéma Georges
- Ong C.
- Ong Cindy
- Opeyemi J-O.
- Oppenheimer C.
- Oppenheimer Clive
- Oppo G.L.
- Orange F.
- Oremus Marc
- Oremus M.
- Ortalo-Magne A.
- Ortalo-Magné A.
- Ortalo-Magné A
- Ortega-Retuerta Eva
- Ortiz Juan-Carlos
- Orvain Jacques
- Ory David
- Osborn David
- Osenberg Craig W
- Osenberg C. W
- O’shea Owen
- Osinga Ronald
- Osuka Kennedy
- O’sullivan John
- Oswald Anne-Sophie
- Otake T.
- Otake Tsuguo
- Ota Yoshitaka
- Otjacques Eve
- Ottaviani Alexandre
- Ottino Garanger Pierre
- Ottino H.
- Ottino P.
- Ouahri Karim
- Ouattara Fatoumata
- Ouédraogo Dakis-Yaoba
- Ouetcho A.
- Ouetcho A.J.
- Ouillon Sylvain
- Ouillon Sylvain
- Ouisse Vincent
- Ourgaud Melanie
- Ourliac-Garnier Isabelle
- Oury Nicolas
- Oury Nicolas
- Ou Tey Putita
- Ou Y.
- Owen Adam