Dag
| Name | Dag |
| Type | Sailing vessel |
| GRT | 250 tons |
| Country |  Swedish |
| Built | 1902 |
| Builder | AB Lödöse Varf, Lödöse |
| Operator | Carl Robert Gustaf André m.fl., Gothenburg |
| History |
U-boat attacks on Sailing vessel Dag
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 13 Mar 1917 | U 62 (Ernst Hashagen) | Sunk | Stopped and scuttled S of Fastnet | 49° 18'N, 9° 28'W | Laguna - Queenstown | logwood | 0 |
Position of attack on Dag
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