| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| D/S Karmsund | 1904 | Norway | ||
| M/S Karmt | 1938 | Norway | Torpedoed, 1945-4-18 | |
| D/S Karmøy | 1921 | Norway | Attacked from air, 1944-10-28 | |
| M/S Karmøy II | 1918 | Norway | ||
| M/T Kars | 1939 | Great Britain | Torpedoed, 1942-2-22 | |
| T/T T2 Karsten Wang | 1944 | Norway | ||
| D/S Kastelholm | 1907 | Finland | ||
| D/S Kastor | 1921 | Greece | ||
| D/S Katanga | 1917 | Belgium | ||
| M/T Katendrecht | 1925 | Netherlands | ||
| D/S Kathariotisa | 1913 | Greece | ||
| D/S Katie Moller | 1919 | Great Britain | ||
| D/S Katingo Hadjipatera | 1913 | Greece | ||
| T/S Katrina Luckenbach | 1918 | USA | ||
| M/S Kattegat | 1936 | Norway | Hijacked, 1942-5-20 | |
| M/T Katy | 1931 | Norway | ||
| D/S Kaupanger | 1930 | Norway | ||
| D/S Kegums | 1912 | Latvia | ||
| D/S Keilehaven | 1919 | Netherlands | ||
| D/S Keith Vawter | 1943 | USA | ||
| D/S Kelbergen | 1914 | Netherlands | ||
| V/B Kelt | 1925 | Norway | ||
| D/S Kem | 1925 | Norway | Sunk by mine, 1940-7-24 | |
| M/S Kengis | 1943 | Sweden | ||
| T/S Kenmar | 1919 | USA |