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TH (1)| Name | Build year | Nationality | Bilde | Loss during WW2 |
|---|---|---|---|---|
| D/S Isaac Shelby | 1944 | USA | Sunk by mine, 1945-1-6 | |
| D/S Isac | 1926 | Great Britain | ||
| D/S Isbjørn | 1907 | Norway | Ran aground, 1944-12-17 | |
| M/S Isbjørn I | 1918 | Norway | ||
| D/S Isbjørn (Isbryter) (DSTO) | 1895 | Norway | Attacked from air, 1942-5-13 | |
| M/T Iselin | 1939 | Norway | ||
| D/S-hvalfanger Isen | Unknown | Norway | ||
| D/S Isfjord | 1884 | Norway | ||
| D/S Isflora | 1917 | Norway | Collision, 1942-8-9 | |
| D/S Island | 1918 | Norway | Torpedoed, 1941-12-5 | |
| D/S Islændingen | 1906 | Norway | ||
| D/S Isolator | 1900 | Panama | ||
| M/T Italia | 1939 | Norway | Torpedoed, 1940-6-15 | |
| D/S Ivan Gorthon | 1935 | Sweden | ||
| D/S Ivan Topic | 1920 | Yugoslavia | ||
| D/S Ivar | 1917 | Denmark | ||
| Jernbark Ivar Aasen | 1870 | Norway | ||
| D/S Ivar Aasen | 1885 | Norway | ||
| M/S Ivaran | 1938 | Norway | ||
| Ukjent "J.3367" | Unknown | |||
| 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 | |
| Ukjent Jager III | Unknown | Norway |