harbour
| Name | Details |
|---|---|
| Karl Emil Ommundsen | Born October 31, 1886 in Søndeled |
| Reidar Ommundsen | Born August 6, 1927 in Kristiansand |
| Svend Ommundsen | Born September 13, 1893 in Søndeled |
| Michael Langballe Onarheim | Born February 28, 1915 in Kvinnherad |
| D/S Onsala | Build year 1857 |
| Peder Theodor Opsal | Born October 11, 1854 in Hammerfest |
| Brigg Ora & Labora | Build year 1841 |
| Gunnar Gjerulf Orenes | Born October 5, 1894 in Eidanger |
| Olav Dahle Orheim | Born August 6, 1918 in Søndeled |
| Bark Orion | Build year 1856 |
| Petter Andreas Emilsen Ormlie | Born May 22, 1897 in Mo i Rana |
| Galeas Ornan | Build year 1859 |
| M/T Osco Linea | Build year 1975 |
| Harry Rasmus Ose | Born March 30, 1915 in Trondfjem |
| Ole Osmundsen | Born September 22, 1845 in Drangedal |
| Oskar Karl August Osmundsen | Born March 24, 1880 in Kragerø |
| M/S Ostfriesland | Build year 1978 |
| D/S Oteren | Build year 1888 |
| Bark Otra | Build year 1886 |
| Jernfullrigger Otra | Build year 1877 |
| D/S Otterdal | Build year 1918 |
| Brigg Otteren | Build year 1841 |
| Einar Rosenkrantz Ottesen | Born February 1, 1898 |
| Halvdan Arneberg Ottesen | Born February 15, 1907 in Sortland |
| Brigg Otto | Build year 1857 |