Princess Dagmar
| Name | Princess Dagmar |
| Type | Steamer |
| GRT | 913 tons |
| Country |  British |
| Built | 1907 |
| Builder | Napier & Miller, Ltd., Glasgow |
| Operator | M. Langlands & Sons, Glasgow |
| History |
U-boat attacks on Steamer Princess Dagmar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 May 1918 | U 54 (Hellmuth von Ruckteschell) | Sunk | Bristol Channel | Swansea - France | coal | 24 | |
| Sunk with all hands and posted as missing. | ||||||||
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