Bedrift O - Frosta
- Oppigard ANS
- Ovation AS
- Otto Aunan
- Orsand Camping AS
- Olavs Gartneri
- Ove Moksnes
- Olav Skogen
- Ola Risan
- Oddbjørn Olsen
- Olav Galtvik
- Olavs Gartneri
- Oddgeir Alstad
- Orsand Holding AS
- Oleksii Chyrkov
- Ole Davidsen
- Oddgeir Alstad
- Ola Staur
- Olsens Mek
- Ola Andreas Lian
- Ole Andres Aunet
- Ole Marius Hovdal
- Odd Terje Rygh
- Odd-Arne Nordahl
- Oddlaug Aunan Nilsen
- Oldervik Gartneri Anne Oldervik
- Odd Kristian Steig Krog
- Orthopaedic Medicine International Omi Norsk Seksjon Are Ingemann