| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| T/S Kenmar | 1919 | USA | ||
| D/S Keret | 1927 | Norway | Torpedoed, 1940-8-22 | |
| Ketos | 1919 | Great Britain | ||
| D/T Ketty Brøvig | 1918 | Norway | Hijacked, 1941-2-2 | |
| M/S Kexholm | 1937 | Sweden | Attacked from air, 1941-4-12 | |
| D/S Keymont | 1928 | Panama | ||
| D/S K. G. Meldahl | 1938 | Norway | Torpedoed, 1942-11-10 | |
| T/S Kiangsu | 1921 | Great Britain | Hijacked, 1941-12-8 | |
| M/S Kilstraum | 1891 | Norway | ||
| D/S King | 1918 | Norway | Ran aground, 1941-11-23 | |
| D/S Kingman | 1934 | Panama | ||
| T/T T2 Kings Canyon | 1945 | USA | ||
| D/S Kingston Hill | 1940 | Great Britain | Torpedoed, 1941-6-8 | |
| M/S Kinn | 1919 | Norway | ||
| M/S Kinsarvik | 1930 | Norway | ||
| D/S Kintore | 1903 | Great Britain | Ran aground, 1944-9-1 | |
| T/T T2 Kirkenes | 1945 | Norway | ||
| D/S Kirsten B | 1930 | Norway | ||
| D/S Kirsten Mærsk | 1921 | Great Britain | ||
| D/S Kiruna | 1921 | Sweden | ||
| D/S Kis | 1915 | Norway | ||
| Torpedobåt Kjell | 1912 | Norway | Hijacked, 1940-4-9 | |
| M/S Kjøpsvik | 1919 | Norway | ||
| M/S Klaus | 1913 | Norway | ||
| D/S Klo | 1937 | Norway |