| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| T/T Jack Carnes | 1942 | USA | Torpedoed, 1942-8-31 | |
| D/S Jacob Christensen | 1920 | Norway | Shuttled, 1940-6-18 | |
| D/S Jadarholm | 1881 | Norway | ||
| D/S Jadarland | 1918 | Norway | Sunk by mine, 1940-5-31 | |
| M/T Jaguar | 1939 | Norway | ||
| M/K Jakk (H 120 H) | 1925 | Norway | ||
| M/S Jamaica | 1936 | Norway | Torpedoed, 1943-3-7 | |
| D/S James A. Bayard | 1943 | USA | ||
| D/S James B. Duke | 1944 | USA | ||
| D/S James B. Eads | 1942 | USA | ||
| D/S James C. Cameron | 1943 | USA | ||
| D/S James E. Haviland | 1943 | USA | ||
| D/S James Ellwood Jones | 1918 | USA | ||
| D/S James Fenimore Cooper | 1942 | USA | ||
| D/S James G. Birney | 1943 | USA | ||
| D/S James G. Blaine | 1942 | USA | ||
| M/T James Hawson | 1930 | Norway | ||
| D/S James Hoban | 1942 | USA | ||
| D/S James Jackson | 1943 | USA | ||
| D/S James Longstreet | 1942 | USA | Ran aground, 1943-10-27 | |
| D/S James L. Richards | 1916 | USA | ||
| D/S James Manning | 1943 | USA | ||
| D/S James McHenry | 1943 | USA | ||
| D/S James M. Gillis | 1943 | USA | ||
| D/S James M. Goodhue | 1943 | USA |