Bedrift O - Lier
- Odins AS
- Orlmed AS
- Olbri AS
- Oraculus AS
- Olea AS
- Oslo Dyrlægeselskap
- Opsal Svein
- Olegas Matiusovas
- Ola Sønstebø
- Ole Tufte
- Olsen Entreprenørtjenester
- Odbjørn Haugen
- Olena Ivliieva
- Oleksandr Pohorielov
- Oleksandr Vietkov
- Olena Maliushytska
- Olena Bolkunevych
- Olesia Donets
- Ove Tufte
- Ove Eriksrud
- Olena Rykhtik
- Oseth Bilpleie
- Ot Auto AS
- Oddevall Skole
- Opsahl Nutrition
- Oak Equity AS
- Oksana Nenchyna
- Odde Kommunikasjon
- Ole Kristian Jensen
- Oliwia Katarzyna Zabowska
- Ole Bror Bentsen AS
- Ole Magnus Tveten
- Oddbjørn Peder Burø
- Oslo Truck Wash AS
- Ole Vidar Eriksrud
- Ole Bjørn Braathen
- Ofstad John E.
- Oak And Stone AS
- Odd Ryghs Stiftelse
- Ovenstad Hans Edvard
- Orre Maskin Service AS
- Ole Hallvard Kveseth
- Olav Leikanger Art
- Ole Rudolf Gilhuus
- Olav Wierli Holding AS
- Ortoped Trond Dalen
- On - Opplæringssenter for Naturbruksfag
- Optimal Helse & Omsorg AS
- Ottar Lingjærdesvei 3 A-F
- Ottar Lingjærdesvei 3 A-F
- Oves Rammeverksted og Helsekost (Life)
- Ofstad Prudence Marketing Prudence W
- Originatorz IT & Software Professionals AS