HMS Pathfinder
| Name | HMS Pathfinder |
| Type | Light cruiser |
| GRT | 2,940 tons |
| Country |  British |
| Built | 1904 |
| Builder | Cammell Laird, Birkenhead |
| Operator | Royal Navy |
| History |
U-boat attacks on Light cruiser Pathfinder
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Sep 1914 | U 21 (Otto Hersing) | Sunk | off Firth of Forth | 56.07N, 02.09W | 260 | ||
| First loss to U-Boat in the history | ||||||||
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