William H. Clifford
| Name | William H. Clifford |
| Type | Sailing vessel |
| GRT | 1,593 tons |
| Country |  American |
| Built | 1895 |
| Builder | Percy & Small, Bath, ME |
| Operator | Atlantic Shipping Co., New York |
| History | Wooden four-masted schooner. |
U-boat attacks on Sailing vessel William H. Clifford
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 Sep 1917 | UB 50 (Franz Becker) | Sunk | Atlantic, stopped and sunk | 48.30N, 12.20W | Le Havre - New York | 0 |
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