Harold
| Name | Harold |
| Type | Sailing vessel |
| GRT | 1,376 tons |
| Country |  British |
| Built | 1888 |
| Builder | R. Duncan & Co., Port Glasgow |
| Operator | J. B. Walmesley & Co., Liverpool |
| History | Steel bark. |
U-boat attacks on Sailing vessel Harold
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Jul 1917 | U 66 (Gerhard Muhle) | Sunk | Torpedoed 65 miles NNW1/2W of Tory Island | Liverpool - Santos | coal | 13 |
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