| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| RS Johan Bruusgaard | Unknown | Norway | ||
| M/S Johan Hjort | 1932 | Norway | ||
| D/S Johan Jebsen | 1894 | Norway | ||
| M/S Johannes | 1908 | Norway | ||
| M/S John Bakke | 1929 | Norway | ||
| M/S John Browne | 1890 | Norway | ||
| M/T John Knudsen | 1934 | Norway | Interned, 1940-6-27 | |
| M/T John P. Pedersen | 1930 | Norway | Torpedoed, 1941-5-20 | |
| M/S Ferje Jonas | 1898 | Norway | ||
| Jakt Jonna | 1869 | Norway | ||
| D/S Jotun | 1892 | Norway | Ran aground, 1939-12-10 | |
| D/S Jotunfjell | 1915 | Norway | ||
| M/T Jotunfjell | 1937 | Norway | ||
| D/S Jotunheim | 1890 | Norway | ||
| D/S Juno | 1886 | Norway | ||
| D/S Jupiter | 1916 | Norway | ||
| D/S Justi | 1889 | Norway | ||
| M/S Juvel | 1936 | Norway | ||
| D/S Jylland | 1887 | Norway | ||
| M/B Jåbæk (M 85 B) | Unknown | Norway | ||
| D/S Jæderen | 1918 | Norway | ||
| M/K Jøkul (M 11 SE) (DSTO) | 1937 | Norway | ||
| D/S Jøna | 1908 | Norway | ||
| D/S Jøsenfjord | 1886 | Norway | ||
| D/S Kai | 1926 | Norway |