- O'Neill Jacki
- Oakley Ian
- Oakley Ian
- Obaid Mohammad
- Obaid Mohammad
- Obbink Michel
- Obrenović Željko
- Obrist Marianna
- Obrist Marianna
- Obrist Marianna
- Occhialini Valentina
- Ocepek Melissa
- Ochiai Yoichi
- Ochoa Xavier
- Ochs Carli
- Octavia Johanna Renny
- Offermans Serge
- Ogunyemi Abiodun
- Oh Jeeyun
- Oh Uran
- Ohler Thorsten
- Oinas-Kukkonen Harri
- Ojala Jarno
- Ojala Timo
- Ojha Sajan Raj
- Oka Kiyoshi
- Okada Kenichi
- Okada Yukihiko
- Oktal Özlem
- Oladimeji Patrick
- Olanda Ricardo
- Olaverri-Monreal Cristina
- Olaya-Figueroa Juan F.
- Olim Sandra Câmara
- Olim Sandra
- Oliva Marta
- Oliveira Elisa
- Oliveira Eva
- Oliveira João
- Oliveira Jr. Edson
- Oliveira Victor
- Olivier Patrick
- Olivier Patrick
- Olson Gary M.
- Olson Judith S.
- Olsson Thomas
- Olsson Thomas
- Olwal Alex
- Omata Masaki
- Omheni Nizar
- Onishi Junji
- Ono Tsukasa
- Oostendorp Herre Van
- Oosterwijk Pieter
- Opozda Sebastian
- Oppenlaender Jonas
- Oppl Stefan
- Orehovački Tihomir
- Oriola Bernard
- Orvalho Veronica
- Ostkmap Morin
- Othman Mohd Kamal
- Otkhmezuri Boris
- Otsuka Kazuhiro
- Otten Wilma
- Otterbacher Jahna
- Oulasvirta Antti
- Ovaska Saila
- Oyedeji Shola
- Oyugi Cecilia
- Ozawa Shiro
- O’hara Kenton
- O’hara Kenton
- O’hara Kenton
- O’modhrain Sile
- O’neill Jacki
- O’neill Jacki