John Knudsen
| Name | John Knudsen |
| Type | Steamer |
| GRT | 1,670 tons |
| Country |  Norwegian |
| Built | 1916 |
| Builder | Laxevaags Maskin & Jernskibsbyg., Bergen |
| Operator | J. Aug. Knudsen, Haugesund |
| History |
U-boat attacks on Steamer John Knudsen
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Sep 1917 | UB 50 (Franz Becker) | Sunk | 20 miles NW1/2W of Cape Falcon | 36.00N, 01.01W | Cardiff - Oran | coal | 1 |
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