Bedrift O - Paradis
- Optex AS
- Odgaard AS
- Olicha AS
- Orrestad AS
- Outreach Norway
- Odland Legetjenester
- Oppigard Barnehage
- Oct Holding AS
- Opdal Save
- Oro Tankers AS
- Oc Capital AS
- Oliv Invest AS
- Ove Strand
- Oliv Holding AS
- Olset Plattform
- Oceanteam Shipping ASA
- Olsen Camilla Meyer
- Om Leela Yoga DA
- Oil Extreme Europe AS
- Ole-Bjørn Tysnes
- Ola Drange Røksund
- Odgaard Service Sykepleie
- Omer Abubaker Transport
- Ove Nord Furnes
- Oskar Nyland Markedsføring
- Opstad Britt Helen Nerheim
- Oas Maritime Consultancy Odd Are Sletten
- Odin Aug Fossmark og Hustru Signes Legat