We have so far registered 19,632 shipping companies
| Name | Founded | | Oluf J. Waarli, Arendal | |
| Oluf Kiær, Drammen | |
| Oluf Lindmann, Lista | |
| Oluf Lohne, Mandal | |
| Oluf M. Coch, Brevik | |
| Oluf N. Nygaard, Nygårdsjøen | |
| Oluf O. Ebbell, Grimstad | Midten 1800 tallet |
| Oluf Onsum, Moss | |
| Oluf Skjelbred Knudsen, Kristiansand | |
| Oluf. S. Wingaard, Kristiansund | |
| Oluf Thomassen, Bergen | |
| O. L. Whist, Kristiania | |
| Olympia Caribean Shipping Co. Inc. Panama | |
| Olympic Explorer K/S, Fosnavåg | |
| Olympic Fiskeri A/S, Fosnavåg | |
| Olympic Havfiske A/S, Fosnavåg | |
| Olympic Herkules K/S, Fosnavåg | |
| Olympic Offshore K/S, Fosnavåg | |
| Olympic Poseidon A/S, Fosnavåg | |
| Olympic Prawn A/S, Fosnavåg | |
| Olympic Ship A/S, Fosnavåg | |
| Olympic Shipping A/S; Fosnavåg | |
| O. Lyng, Kragerø | |
| Oma Baatbyggeri A/S, Stord | |
| O. M. Abrahamsen, Farsund | |
