Bedrift O - Trysil
- Opsis AS
- Ola Rundfloen
- Ola Bekkelund
- Ohbeley Hemstad
- Olav Bø
- Olav Bø
- Ola Nymoen
- Orwo Invest AS
- Oulie Eiendom AS
- Occasio Consulting AS
- Orca Konsult AS
- Opus Norway Skjæraasen
- Ole Gjermund Nymoen
- Oddrun Borg Rasmussen
- Odd Magne Myhre
- Omsorgstjenesten i Trysil
- Ola Gerhard Sørhuus
- O G Sørhuus AS
- Oda Sanaker Invest AS
- Ole Hallstein Holding AS
- Olav Søren Kilde
- Olsen Ailisha Kaiya Joan
- Olles Adventure4all Monika Anna-Katarina Mathiasson