- Ocampo Madelaine
- Ocariz Jose Humberto
- Ochi Atsuhiko
- Ochoa Ines
- Offermann Jan Tuzlic
- Ogrodnik Agnieszka Ewa
- Oh Alexander
- Ohm Christian
- Oide Hideyuki
- Oishi Reiyo
- Ojeda Martina Laura
- Okumura Yasuyuki
- Oleksiyuk Ivan
- Olivares Pino Sebastian Andres
- Oliveira Correa Gabriel
- Oliveira Damazio Denis
- Oliver Jason