Cysne
| Name | Cysne |
| Type | Steamer |
| GRT | 623 tons |
| Country |  Portuguese |
| Built | 1879 |
| Builder | W. H. Potter & Co., Liverpool |
| Operator | Glama & Marinho, Oporto |
| History |
U-boat attacks on Steamer Cysne
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 May 1915 | U 41 (Klaus Hansen) | Sunk | 50 miles NW of Ushant | Oporto - Newport, Mon |
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