Bertha
| Name | Bertha |
| Type | Sailing vessel |
| GRT | 591 tons |
| Country |  Swedish |
| Built | 1874 |
| Builder | N. Jacobsen, Apenrade |
| Operator | Mjelloms Rederi AB |
| History | Wooden bark. |
U-boat attacks on Sailing vessel Bertha
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Nov 1916 | U 69 (Ernst Wilhelms) | Sunk | Stopped and sunk E of the Shetlands | Halmstad - West-Hartlepool | pit props | 0 |
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