We have so far registered 5,291 ships
| Name | Build year | Nationality | Image | Loss during WW2 |
|---|---|---|---|---|
| D/S Osric | 1919 | Sweden | ||
| D/S Ostende | 1903 | Belgium | ||
| D/S Oster | 1908 | Norway | Hijacked May 1940 | |
| M/S Osterfjord | 1914 | Norway | ||
| M/K Osvald | Norway | Ran aground March 2, 1942 | ||
| D/S Otavi | 1919 | South Africa | ||
| D/S Oter I | 1929 | Norway | ||
| Otra II | Norway | |||
| T/S Otranto | 1925 | United Kingdom | ||
| D/S Ottar Jarl | 1921 | Norway | Torpedoed September 12, 1941 | |
| D/S Otteid | 1926 | Norway | ||
| D/S Ottern | 1937 | Norway | ||
| D/S Ove Toft | 1921 | Denmark | ||
| M/S Oxelösund | 1923 | Sweden | ||
| D/S Ozark | 1919 | USA | ||
| T/S Pacific | 1915 | United Kingdom | Torpedoed March 2, 1941 | |
| M/S Pacific | 1914 | Sweden | ||
| M/S Pacific President | 1928 | United Kingdom | Torpedoed December 2, 1940 | |
| D/T Paez | 1927 | Venezuela | ||
| D/S Pagasitikos | 1914 | Greece | Shuttled March 23, 1943 | |
| M/S Pajala | 1924 | Sweden | Torpedoed January 18, 1940 | |
| D/S Palermo | 1938 | United Kingdom | ||
| D/S Pallas | 1922 | Norway | Collision February 3, 1940 | |
| M/S Pallas | 1941 | Norway | Hijacked October 1944 | |
| M/S Palomares | 1937 | United Kingdom |
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