Sieka
| Name | Sieka |
| Type | Sailing vessel |
| GRT | 119 tons |
| Country |  Dutch |
| Built | 1914 |
| Builder | |
| Operator | W. Mulder, Stadskanaal |
| History |
U-boat attacks on Sailing vessel Sieka
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 18 Dec 1916 | U 71 (Hugo Schmidt) | Sunk | Stopped and sunk in the North Sea | 56° 43'N, 4° 35'E | Christiana - West-Hartlepool | pitprops | 0 |
| Crew taken on board and landed at Wilhelmshaven | ||||||||
Position of attack on Sieka
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