Vi har så langt registrert 19 632 rederier
| Navn | Grunnlagt | | Oslo Line A/S, Kristiansand | |
| Oslo Offshore A/S, Oslo | |
| Oslo Oljebunkring A/S, Oslo | |
| Oslo Sand og Bergsalt A/S, Oslo | |
| Oslo Shipholding A/S, Larvik | |
| Oslo Shipholding A/S, Oslo | |
| Oslo Ship Management A/S,Oslo | |
| Oslo Skoleskib, Oslo | |
| Oslo Tankers A/S, Oslo | |
| Oslo Taubåt A/S, Oslo | |
| OSM Maritime A/S, Bergen / Oslo | |
| OSM Norway A/S, Arendal | |
| OSM Offshore A/S, Arendal | |
| OSM Ship Management A/S, Arendal | |
| OSM Ship Management A/S, Farsund | |
| OSM Ship Management A/S, Stavanger | |
| Osmund B.Songe | |
| Osmund Hamre, Haugesund | |
| Osmund Isachsen, Farsund | |
| Osmund Isaksen, Birkenes | |
| Osmund Johannesen, Brattholmen | |
| Osmundsen,Abraham, Spind | |
| Osmundsvaag, Jon Magnus, Måløy | |
| Osmund Tobiassen, Djupvig, Spind, Farsund | |
| Osnes,Johannes,Alesund | |
