Friso
| Name | Friso |
| Type | Sailing vessel |
| GRT | 171 tons |
| Country |  Dutch |
| Built | 1916 |
| Builder | J.J. Patje & Zonen, Waterhuizen |
| Operator | G. Wiersma, Groningen |
| History | Steel-hulled three masted schooner |
U-boat attacks on Sailing vessel Friso
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 May 1917 | UB 20 (Hermann Glimpf) | Sunk | Stopped and sunk SE of Start Point | Fowey - Amsterdam | pipe clay |
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