Enlistment district
| Name | Details |
|---|---|
| Richard Martinius Olsen | Born March 17, 1899 in Oslo |
| Sten Norman Olsen | Born November 16, 1916 in Oslo |
| Paul Olsen Saaler | Born January 4, 1910 in Oslo |
| Trygve Gotfred Olsen | Born August 17, 1888 in Oslo |
| Viggo Olsen | Born October 4, 1920 in Oslo |
| Viktor Bjørn Olsen | Born December 15, 1916 |
| Walter Gabriel Olsen (Wisback) | Born July 3, 1910 in Akerhus |
| Erland Andreas Olufsen | Born December 23, 1902 in Tromsø |
| M/T Olymp | Build year 1962 |
| M/S Onstad Trader | Build year 1982 |
| M/S Oplandet | Build year 1920 |
| M/S Opo | Build year 1946 |
| M/S Opo | Build year 1946 |
| M/S Oregon Express | Build year 1945 |
| D/S Oria | Build year 1920 |
| M/T Orkdal | Build year 1951 |
| D/S Orkla | Build year 1918 |
| M/S Oro Chief | Build year 1977 |
| M/S Orvald Syversen | Build year 1911 |
| D/S Oscarsborg I | Build year 1904 |
| Asbjørn Erik Oscarsen | Born September 12, 1923 in Hamar |
| Harry Rolf Oscarsen | Born November 6, 1923 in Oslo |
| Per Håvard Oscarsen | Born October 1, 1921 in Oslo |
| M/T LPG Oscar Viking | Build year 1983 |
| M/T Osco Beduin | Build year 1987 |