Costas
| Name | Costas |
| Type | Steamer |
| GRT | 3,278 tons |
| Country |  Greek |
| Built | 1896 |
| Builder | R. Thompson & Son, Sunderland |
| Operator | A. A. Embiricos (Hellenic Shipowning Co., Ltd.), Andros |
| History |
U-boat attacks on Steamer Costas
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 9 Dec 1917 | UC 53 (Kurt Albrecht) | Sunk | Italian coast off Cape Vaticano | 38.44N, 15.34E | Karachi - Milos | 0 |
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