| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| U.S. Army Taubåt LT-647 | Unknown | USA | ||
| D/S Lublin | 1932 | Poland | ||
| M/T Lubrafol | 1924 | Panama | Torpedoed, 1942-5-9 | |
| D/S Lucien B. Maxwell | 1943 | USA | ||
| D/S Lucretia Mott | 1943 | USA | ||
| D/S Ludo | 1903 | Norway | ||
| T/S Luise Nielsen | Unknown | Norway | ||
| D/S Lulworth Hill | 1940 | Great Britain | Torpedoed, 1943-3-19 | |
| D/S Luna | 1911 | Norway | Torpedoed, 1939-12-31 | |
| T/T T2 Lundy's Lane | 1943 | USA | ||
| M/S Luossa | 1923 | Sweden | ||
| D/S Lurigethan | 1916 | Great Britain | Attacked from air, 1941-1-23 | |
| T/S Lurline | 1932 | USA | ||
| D/S Lustrous | 1927 | Great Britain | Shelled by gunfire, 1941-2-22 | |
| D/S Lutz | 1933 | Norway | ||
| M/S Luxmi | 1924 | Great Britain | ||
| M/S Lyaholm | 1916 | Norway | ||
| D/S Lyder Sagen | 1918 | Norway | ||
| D/S Lygra | 1899 | Norway | ||
| M/B Lygrefjord | 1919 | Norway | ||
| D/S Lyng | 1920 | Norway | Collision, 1942-12-9 | |
| D/S Lyngdal | 1912 | Norway | ||
| D/S Lyngen | 1931 | Norway | ||
| D/S Lynghaug | 1919 | Norway | Shuttled, 1944-6-10 | |
| D/S Lyngør | 1884 | Norway |