- Olivia Sheng
- Olivier Allais
- Olivier Toubia
- Olvi Mangasarian
- Olympic Games
- Omar Besbes
- Omar Besbes, Yonatan Gur, N. Bora Keskin, Assaf Zeevi
- Omar El Housni
- Omar Mouchtaki
- Omar Romero Hernandez
- Omar Skali Lami
- Omer Beyca
- Ömer Burak Kınay
- Omid Nohadani
- Omid Rafieian
- Omkar Thakoor
- Omogbolade Ajayi
- Omya Hustadmarmor
- Onesun Yoo
- Onno Boxma
