Sir Joseph
| Name | Sir Joseph |
| Type | Sailing vessel |
| GRT | 84 tons |
| Country |  British |
| Built | 1879 |
| Builder | Marshall, Plymouth |
| Operator | John J. Nash, Plymouth |
| History | Wooden ketch. |
U-boat attacks on Sailing vessel Sir Joseph
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 Mar 1917 | UB 18 (Claus Lafrenz) | Sunk | Stopped and sunk 30 miles SSE of Start Point | Granville - Plymouth | in ballast | 0 |
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