Seistan
| Name | Seistan |
| Type | Steamer |
| GRT | 4,238 tons |
| Country |  British |
| Built | 1907 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | Strick Line, Ltd. (F. C. Strick & Co., Ltd.), Swansea |
| History |
U-boat attacks on Steamer Seistan
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Oct 1917 | UB 57 (Otto Steinbrinck) | Sunk | 3.5 miles NxW1/4W from Flamborough Head | 54.09N, 00.08W | Tyne - Falmouth (for orders) | coal | 5 |
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