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