Bertha
| Name | Bertha |
| Type | Trawler |
| GRT | 185 tons |
| Country |  Dutch |
| Built | 1900 |
| Builder | Hall, Russell & Co., Ltd, Aberdeen |
| Operator | N.V. Viss. Maats. Vigor III (Ocean Viss, Maats), Ymuiden |
| History | Built as Strathcona. |
U-boat attacks on Trawler Bertha
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Sep 1917 | UB 34 (Hellmuth von Ruckteschell) | prize | Taken as a prize in the German Bight, later released |
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