Tb. 11
| Name | Tb. 11 |
| Type | Torpedo Boat |
| GRT | 263 tons |
| Country |  British |
| Built | 1907 |
| Builder | Yarrow & Co., Ltd., Scotstoun |
| Operator | Royal Navy |
| History | Built as Mayfly. |
U-boat attacks on Torpedo Boat Tb. 11
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 7 Mar 1916 | UC 10 (Alfred Nitzsche) | Sunk | Mined north entrance to Black Deep. | 51.48N, 01.34E | on patrol | 23 |
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