Bedrift O - Frogner Oslo
- Oft AS
- Oik AS
- Olili AS
- Okb AS
- Oeio AS
- Okamo AS
- Oceanness AS
- Overita AS
- Olofssons
- Ola & Co AS
- Osvest AS
- Optigon AS
- Ole AS
- Odi Europe Ltd
- Olha Odlivanska
- Opus Skateboard DA
- Oliver Persson
- Oddvar Aurstad
- Offyx Equity AS
- Ollie Hermansson
- Owesen Prosa
- Olema Invest AS
- Oddbjørn Overskott
- Oda Fish AS
- Ob12 Kapital AS
- Oscar Wicken
- Ola Jordhøy
- Ola Jordhøy
- Oslo Nowhere AS
- Opplevelses Design
- Ocn Eiendom AS
- Oslo Airdome
- Oslo Airdome
- Osay Holding AS
- Ozone Skandinavia AS
- Omsåsen Utvikling AS
- OSL Contemporary AS
- Olaska Holding AS
- Oli Eiendom AS
- Olsen Events
- Olrich Invest AS
- Oslo Kvartetforening
- Opera Andersen
- Oslo Myntgalleri AS
- Oslo Myntgalleri AS
- Otero Media AS
- Os Advokater DA
- Oscar Pressebyrå AS
- Oase Media AS
- Oma Group AS
- Operis Consulting AS
- Onuchak Julia
- Otero Media AS
- Oslo Syn AS
- Omrod Invest AS
- Oslo Sykkelpolo
- Ovibos Investments AS
- Oslo Museum
- Ona Studio AS
- Omsorg Konsult AS
- Oslo Utleie AS
- Orfeus Publishing AS
- Oslo Eiendomsinvestering AS
- Oftebro Elisabeth
- Ola L. AS
- Oslo Byinvest AS
- Ole Bjarne Kverneland
- O. Steen Holding AS
- Oslo Limo Xhilaga
- Oslo Salgsvogn Utleie AS
- Olav Kaspar Melle
- Oneint Lebal Limited
- Opsal og Gabrielsen AS
- Olav Rønningen Wangensteen
- Oslo Guide Company AS
- O.Øen Invest AS
- Okamo Bogstadveien 39 AS
- Oslo Beauty Lab AS
- Oslo Nail Haider
- Oscar Werner Productions
- Oslo Team Trafikkskole AS
- Oppussingsservice Jacek Ciaputa
- Odinsgt 13 B AS
- Oslo Kunstløpklubb Il
- Oddvar Mareno Nilsen
- Oslo Kunstløpklubb Il
- Oslo Team Trafikkopplæring AS
- Ole Falk Frederiksen
- Oslo Beauty Center AS
- Oslo Peace Week AS
- Ole Kristian Hersløv
- Oslo Entreprenøren Emin
- Otto Closs Konsulenttjenester AS
- Oslo Private Legevakt AS
- Oslo Band Hospits
- Oslo vest Rotary Klubb
- Oslo Jordmor og Ultralydklinikk AS
- Ovmo Rådgivning Monsen Dødsbo
- Orozco Martinez Theater Projects
- Ola Grimsby Institute Europe AS
- Ohc Arkitektur & Design AS
- Oslo International Film Festival AS
- Oslo Online Johanne Askedal
- Orazio A. C. Truglio
- Ori Fur i Norge
- Oslo Tannlegevakt Anita Berntzen
- Ori Fur i Norge
- Oslo Beauty Lab AS Tvangsavviklingsbo
- Oslo Beauty Lab AS Tvangsavviklingsbo
- Oberst Rodes vei 46 AS
- Ole-Christian Kreyberg Normann
- Ole Herman Schøyen Sjölin
- Olsen Ella M Cavnicka Psykolog
- Ot Consulting Ole Bendik Thorvik
- Operasjonssykepleier Kaja Katrine Gulseth-With
- Oslo Ashihara Karate og Fysioterapi AS
- Oab Helse Ulv Ola Adelsten Bredal
- Oil On Canvas By Kari Eig
- Organic Pet Heaven Victoria Swane Høisæther