John Hays Hammond
| Name | John Hays Hammond |
| Type | Sailing Vessel |
| GRT | 132 tons |
| Country |  American |
| Built | 1907 |
| Builder | James & Tarr, Essex, MA |
| Operator | David W. Simpson, Boston |
| History | Wooden schooner. |
U-boat attacks on Sailing Vessel John Hays Hammond
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 Jul 1917 | U 44 (Paul Wagenführ) | Sunk | Stopped and sunk 350 miles NW of Ireland | 56.54N, 14.18W | Fleetwood - Iceland | 0 |
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