Bedrift O - Rasta
- Omitofu AS
- Oncom Ltd
- Oksana Batanovska
- Olga Rudaev
- Olena Zahrodtska
- Olena Yakymenko
- Oleksandr Shkulipa
- Oleksandr Zabotskyi
- Olena Kalthyina
- Oksana Kazmina
- Oleksandr Pienov
- Olha Ternova
- Oleksandr Aksonov
- Osteopat Sagplads
- Ovali Consulting AS
- Ove Hansen
- Olstad Eiendom AS
- Oleksandr Koverko
- Olh Sandovskyi
- Olena Mstviienko
- Oksana Parfeniuk
- Ofitserovas Tolketjenester
- Oleksandr Pomazanov
- Olga Pomazanova
- Ola Løberg
- Osama Mahmood
- Ohr Lena Gussiås
- O1e Consulting, Berntzen
- Oslo Watch Club AS
- Ove Peter Oddsteen
- Ovio Netthandel Ostadi
- Odins Wrapping Munoz Hurtado
- Oda Karin Ytreøy Bakken