Harriet Williams
| Name | Harriet Williams |
| Type | Sailing vessel |
| GRT | 157 tons |
| Country |  British |
| Built | 1866 |
| Builder | Wray, Burton Stather |
| Operator | E. Stephens, Fowey |
| History | Wooden schooner. |
U-boat attacks on Sailing vessel Harriet Williams
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Feb 1917 | UB 18 (Claus Lafrenz) | Sunk | Stopped and scuttled 15 miles NNE Cape d’Antifer | London - Havre | pitch in bulk | 0 |
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