Bedrift O - Røa
- Otterskog AS
- Onecons AS
- Omenapuu AS
- Oremus/Norsk Tidebønn
- Olaf Devik
- Oslo Toastmasters
- Oddbjørn Sørmoen
- Oslo Kvinnehelsesenter
- Ormholt Finans
- Opo Investment AS
- Oha Holding AS
- Oddvar Johansen AS
- Optimal Invest AS
- Oda Berg
- Oslo Bueskyttere
- Ola Henmo
- Omerta Holding AS
- Oslo Mikrospinneri AS
- Opus One AS
- Oh Yes AS
- Oslo Yoga AS
- Otterbu Pt
- Orebakken Borettslag
- Orso Invest AS
- Orebakken Barnehage
- Oslo Implantatsenter AS
- Olad Transport
- Oftebro Eivind
- Ottersen Engineering
- Oslo Strykekvartett DA
- Orbita Synskirurgi AS
- Osteopat Ingrid Nicander
- Oslo Horse Show AS
- Oslo Kristi Forsamling
- Opp & Frem AS
- Odontia Tannlegene Røa
- Ole A Nordby AS
- Oslo vest Eiendomsmegling AS
- Opper Emma Marie
- Optiker Linn Bøe
- Odd Jobs Emilsen
- Ostadalsveien 2c/4/6 Vel
- Ortuno Daniel Puche
- Ostadalsveien 2c/4/6 Vel
- Olav Abel Engh
- Ordsmed Harald Mæle
- Openings, Hanna Finborud
- Oskar Kristiansen Invest AS
- Oslo vest Trafikkskole AS
- Ole Deviksvei 16 AS
- On Demand Barbers AS
- Oak & Kitchen AS
- Oslo vest Elektro AS
- Oslo vest Elektro AS
- Oslo Data Support
- Ole Kristian Wetten
- Oslo vest Frivilligsentral
- Oslo vest Frivilligsentral
- Oslo Sporveiers Musikkorps
- Odd Johan Moen
- Omg! Yoga - Monica Holm
- Oslo Horse Show Promotion AS
- O T Hagens Forening
- Oslo Mastering Henning Bortne
- Olav Brunborgs vei 13 AS
- Ossy Movers Kingsley Nnaji
- Oslo/Akershus Lymfødem og Lipødemforening
- Ottersbo Holding & Invest AS
- Oslo og Akershus Skiskytterkrets
- Onyx Noir Jewelry Dagfinrud
- Oslo Kvensk-Finsk Forening
- Oslo og Akershus Skiskytterkrets
- Oneflex Pål Bugge-Amundsen
- Oslo City Taxi Almrawweh
- Oslo Mobile Bilvask/ Abby
- Old House Bolig Service Pawlowski
- Omholt Financial Research And Consulting
- Oslo Bugle & Drum Corps
- Oslo Bugle & Drum Corps
- Oda Ravlo Helhet og Helse
- Oslo Krets Av Norges Kvinne- og Familieforbund
- Oslo Kommune Bydel 7 vestre Aker Kommunale Leger
- Odd Thorsen Design & Arkitektur Innehaver Liv Kathryn Thorsen