We have so far registered 92,376 seafarers
| Name | Born | Place of birth (place of living shown if missing) | | Marcus Onerød | April 4, 1906 | Born in Fredrikstad | |
| Leif Oskar Ophus | July 16, 1920 | Born in Siljan | |
| Sverre Kjell Opsahl | April 8, 1923 | Born in Sarpsborg | |
| Rolf Opøien | August 17, 1921 | Lived in Hagen i Askim | |
| Sverre Kristian Orefellen | March 19, 1920 | Born in Rygge | |
| Oskar Hilmar Orud | October 27, 1907 | Born in Sarpsborg | |
| Alf Oskar Anderson | August 10, 1916 | Born in Borge | |
| Jakob Osther | December 12, 1923 | Born in Bærum | |
| Gotfred Martinius Drange Osufsen | July 26, 1891 | Born in Mandal | |
| Anton Eilert Ottersen | March 29, 1901 | Lived in Møller gt. 7 Moss | |
| Odd Lie Ottersen | December 8, 1907 | Born in Glemmen | |
| Øystein N.Sofus Ottersen | October 6, 1896 | Born in Fredrikstad | |
| Harald Ottesen | October 4, 1905 | Born in Hvaler | |
| Henry Olavsen Ottesen | April 18, 1909 | Born in Fredrikstad | |
| John Fredrik Ottesen | August 26, 1907 | Born in Hvaler | |
| Kjell Otto Ottesen | September 5, 1910 | Born in Onsøy | |
| Ottar Fridthjof Lind Ottesen | May 7, 1906 | Born in Fredrikstad | |
| Odd Thomas Oulie | April 15, 1913 | Born in Sarpsborg | |
| Ole Martin Oustorp | May 28, 1921 | Born in Rakkestad | |
| John Ragnar Owen | February 17, 1916 | Lived in Son | |
| Thor Chønang Owren | November 6, 1920 | Born in Mysen | |
| Rolf Kolbjørn Pahle | November 30, 1918 | Born in Fredrikstad | |
| Anders Henry Paulsen | October 9, 1909 | Born in Onsøy | |
| Arve Aleksander Paulsen | December 11, 1915 | Born in Onsøy | |
| Johan Arnt Paulsen | June 18, 1907 | Lived in Engelsviken, Onsøy | |