Demaris
| Name | Demaris |
| Type | Sailing vessel |
| GRT | 98 tons |
| Country |  British |
| Built | 1859 |
| Builder | Day, Goole |
| Operator | George Brown, Goole |
| History | Wooden schooner |
U-boat attacks on Sailing vessel Demaris
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Aug 1916 | UB 18 (Otto Steinbrinck) | Sunk | 20 miles N of Alderney | Guernsey - London | stone | 0 |
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