Bedrift O - Degernes
- Oremo AS
- Okeh AS
- Orud gård ANS
- Olsen Gustav
- Olav Aanonsen
- Ok Lund AS
- Ole Kristian Paulsrud
- Ole Christian Mustorp
- Odd Dagfinn Søtorp
- Ole Reidar Grimsrud
- Ole-Håkon Heier
- Ole Petter Lunde
- Ole Petter Fjeld
- Oscar A Hagen
- Ole Jørgen Bjørnstad
- Ole Kristian Lund
- Oddvar Georg Heier
- Oldtimers Workshop Jakobsen
- Ole Kristian Christoffersen Taxi
- O-Dekor Knut Ivar Orud
- Oremo gård Roar Henry Jakobsen
- Ole Martin Stensrud / Stensrudåsen Masseuttak