S.D.
| Name | S.D. |
| Type | Sailing vessel |
| GRT | 131 tons |
| Country |  British |
| Built | 1902 |
| Builder | Smeed, Dean, & Co. Ld., Sittingbourne |
| Operator | Smeed, Dean, & Co. Ld., London |
| History | Wooden ketch sailing barge |
U-boat attacks on Sailing vessel S.D.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Aug 1916 | UB 18 (Otto Steinbrinck) | Sunk | Stopped and sunk 18 miles NNW of Cape Antifer | 0 |
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