Bedrift O - Grimstad
- Ocellaris AS
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- Optikkhuset
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- Organisasjon 8
- Organisasjon 8
- Olaf Tønnevold
- Oriented Soft AS -
- Oriented Soft AS
- Oland Aksel
- Oddvar Vik
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- Olav Lindstøl AS
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- Oskar Johansson
- Onetwoten Norge
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- O T Tønnevold AS
- Olsen Banden IT
- Odd Eldar Tveiten
- Opsahlveien 1 234 AS
- Office Pfm Printing
- Oh Trondsen Holding AS
- O. Evenstad Holding AS
- Ole Johan Stensvand
- Ola Hvidebergsgaard Eggen
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- Ole Didrik Steensohn
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- Odd Arild Svaland
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- Olaf Tønnevold & Sønner AS
- One Tree Forest Fossnes
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- Olsens Tangenter Sebastian Olsen
- Odd Henning Bråtelund Felle
- Oto Signalteknikk Oddbjørn Tollefsen
- Odd Fellow Loge Nr 152 Fjære
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- Oles Rehabilitering og Vedlikehold Ole Ugland
- Ord Underveis - Grace S. Torsøe Johansen
- Odd Fellow Loge Nr. 98 Henrik Ibsen