| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| D/S Older | 1902 | Norway | ||
| D/S Oldernæs | 1899 | Norway | ||
| D/S Ole Bull | 1883 | Norway | ||
| D/S Ole Bull | 1901 | Norway | ||
| Bark Ole Knudsen | 1890 | Norway | ||
| D/S Ole Lea | 1880 | Norway | ||
| D/S Ole Wegger | 1911 | Norway | ||
| Stålbark 4 master Olivebank | 1892 | Norway | ||
| Bark Olivia | 1894 | Norway | ||
| D/S Ontaneda | 1895 | Norway | ||
| D/S Ophir | 1906 | Norway | ||
| D/S Opland | 1903 | Norway | ||
| D/S Ora | 1915 | Norway | ||
| D/S Oregon | 1890 | Norway | ||
| D/S Oria | 1913 | Norway | ||
| Bark Orient | 1877 | Norway | ||
| D/S Origen | 1886 | Norway | ||
| D/S Orion | 1882 | Norway | ||
| M/S Orion I | 1907 | Norway | ||
| D/S Orkedal | 1906 | Norway | ||
| D/S Orkla | 1869 | Norway | ||
| D/S Orkla | 1908 | Norway | ||
| Bark Orkney | 1872 | Norway | ||
| D/S Orla | 1914 | Norway | ||
| Kutter Orlando | 1885 | Norway |