Sagitta
| Name | Sagitta |
| Type | Sailing vessel |
| GRT | 1,981 tons |
| Country |  Norwegian |
| Built | 1898 |
| Builder | A. Dubigeon, Nantes |
| Operator | A/S Christianssand (S. O. Stray & Co.), Kristiansand |
| History | Steel-hulled bark. Built as Grand Duchesse Olga. |
U-boat attacks on Sailing vessel Sagitta
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Apr 1917 | U 78 (Otto Dröscher) | Sunk | Stopped and sunk in the northern North Sea | 60.00N, 02.00W | Savannah GA - Kalundborg | cotton and oilcake | 0 |
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