Thyra
| Name | Thyra |
| Type | Sailing vessel |
| GRT | 285 tons |
| Country |  Danish |
| Built | 1900 |
| Builder | A. Aanonsen, Arendal |
| Operator | A/S Hans Petersen, Marstal |
| History | Three-masted wooden schooner. |
U-boat attacks on Sailing vessel Thyra
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 May 1917 | UB 38 (Wilhelm Amberger) | Sunk | Stopped and scuttled 45 miles SSE of Start Point | Haiti - Havre | dyewood | 0 |
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