Costello
| Name | Costello |
| Type | Steamer |
| GRT | 1,591 tons |
| Country |  British |
| Built | 1903 |
| Builder | Chas. Connell & Co., Ltd., Glasgow |
| Operator | Atlantic & Eastern SS. Co., Ltd. (J. Glynn & Son), Liverpool |
| History |
U-boat attacks on Steamer Costello
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Aug 1915 | U 28 (Georg-Günther von Forstner) | Sunk | 95 miles WxS of Bishop Rock | 49.02N, 08.30W | Liverpool - Genoa | general cargo | 1 |
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