Enlistment district
| Name | Details |
|---|---|
| D/S Olaf Kyrre | Build year 1886 |
| D/S Olaf Trygvesøn | Build year 1876 |
| D/S Olaf Trygvesøn | Build year 1870 |
| M/S Olavsbussen | Build year 1974 |
| Jens Guttormsen Olden | Born October 30, 1908 in Bjugn |
| Paul Alfred Olden | Born October 25, 1914 in Åfjord |
| Jørund Oldren | Born March 16, 1917 in Stjørna, Bjung |
| D/S Ole Bull | Build year 1882 |
| Martel Olsen | Born September 21, 1903 in Verdal |
| Odd Olsen | Born January 25, 1919 in Trondheim |
| Odd Alf Olsen | Born July 2, 1919 in Namsos |
| D/S Orm Jarl | Build year 1939 |
| M/S Orm Jarl | Build year 1967 |
| D/S Orm Jarl | Build year 1922 |
| D/S Orm Jarl | Build year 1888 |
| M/S Orm Jarl | Build year 1961 |
| M/T Orvos | Build year 1968 |
| M/S Ostra Pall | Build year 1966 |
| D/S Ottar Jarl | Build year 1921 |
| M/S Ottar Jarl | Build year 1929 |
| Alf Johannes Ottesen | Born January 26, 1911 in Trondheim |
| Bjarne Margide Overrein | Born December 6, 1919 in Trondheim |
| Jan Gerhard Ovidth | Born March 28, 1923 in Brønnøysund |
| D/S Parat | Build year 1913 |
| John Herman Pedersen | Born October 29, 1921 in Strinda |