- O'Brien Katie
- O'Malley David
- O'Mara Tracy
- O'Shaughnessy-Kirwan Aoife
- Oba K.
- Obazee Ofure
- Obdeijn Inge
- Obeid Patricia
- Oberlin Odile
- Obozinski Guillaume
- Obozinski Guillaume
- Odunsi Kunle
- Offer John
- Offit Kenneth
- Offner Nicolas
- Ojcius David
- Okamoto Ikuhiro
- Okonechnikov Konstantin
- Olah Edith
- Olaso Robert E
- Olaso Robert
- Oliva Baldo
- Oliver Carlos
- Oliver Victor
- Olivier Raphael
- Olivier-Faivre Laurence
- Olivier-Faivre Laurence
- Olopade Olufunmilayo
- Olopade Olufunmilayo
- Olschwang Sylviane
- Olshan Andrew F.
- Olson Janet
- Olsson Håkan
- Olswold Curtis
- Olteanu M.
- Olteanu Madalina
- Olteanu Madalina
- Ong Kai-Ren
- Ong Kai-Ren
- Onland-Moret N Charlotte
- Ooi Chia Huey
- Oosterwijk Jan
- Opiyo Stephen
- Opolon Paule
- Orciuolo Enrico
- Orengo Christine
- Orfila Anne-Marie
- Orlando David
- Orlic-Milacic Marija
- Orlova Yuliya V
- Ornatsky Olga
- Orr Nicholas
- Orsi Fabienne
- Orsulic Sandra
- Ortega-Perez Inmaculada
- Orth Martin F.
- Ortiz Rosa Maria
- Ory Catherine
- Oshurko Eugenia
- Osorio Ana
- Ostaszewski Marek
- Ostaszewski Marek
- Ostroumova Evgenia V.
- Ostroumova Evgenia
- Ott Claus-Eric
- Ott Patrick Alexander
- Ottaviani Daniela
- Ottini Laura
- Ottini Laura
- Ouazzani Jamal
- Ouerhani Slah
- Ouine Berengere
- Ouine Bérèngere
- Ouldamer Lobna
- Outh-Gauer S
- Ouwens Klaasjan
- Ouyang Wei
- Ouyang Wei
- Overall Rupert W
- Overbeek Lucy
- Overington John P
- O’carroll Dónal
- O’mara Tracy
- O’neil Bert H.
- O’reilly Martin