Bertha
| Name | Bertha |
| Type | Sailing vessel |
| GRT | 107 tons |
| Country |  Portuguese |
| Built | 1904 |
| Builder | José Martins de Araújo Jr., Vila do Conde |
| Operator | Firma Castro?, Lisbon |
| History | Wooden schooner. Built as Américo Faria. |
U-boat attacks on Sailing vessel Bertha
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Jul 1917 | UC 69 (Erwin Waßner) | Sunk | Stopped and sunk W of Villa do Conde | 41.20N, 08.58W | in ballast |
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