Challenger
| Name | Challenger |
| Type | Fishing vessel (smack) |
| GRT | 50 tons |
| Country |  British |
| Built | 1897 |
| Builder | ?, Lowestoft |
| Operator | William Lang, Jr., Lowestoft |
| History | Fishing registration: LT 721 |
U-boat attacks on Fishing vessel (smack) Challenger
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Aug 1915 | UB 12 (Hans Nieland) | Sunk | Stopped and scuttled 23 miles ExN of Lowestoft | 0 |
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