Bedrift O - Tistedal
- Oslovent AS
- Olsen Kenneth
- Oslovent AS Konkursbo
- Oslovent AS Konkursbo
- Ola's Bilverksted
- Olsen Lagerstøping
- Oppussingstjenester Grochowski
- Orød Lystgård ANS
- Ove Johansen
- Orødgrenda 17
- Orødgrenda 17
- Otkat Capital AS
- Orhaugen Lars Hurlen
- Olaf Hansens Eftf AS
- Osteopat Kent Mikalsen
- Ole Johannes Solberg
- Oslo City Bagorama
- O R Andersen Consult