Frithjof
| Name | Frithjof |
| Type | Steamer |
| GRT | 1,389 tons |
| Country |  Norwegian |
| Built | 1902 |
| Builder | Selby SB. & Eng. Co., Ltd., Selby |
| Operator | A/S Frithjof (Alf. Monsen), Tønsberg |
| History |
U-boat attacks on Steamer Frithjof
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Jul 1917 | UC 69 (Erwin Waßner) | Sunk | off Cape Prior | 43.39N, 02.10W | La Goulette - Maryport | iron ore | 0 |
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