Ostrich
| Name | Ostrich |
| Type | Trawler |
| GRT | 148 tons |
| Country |  British |
| Built | 1899 |
| Builder | Cook, Welton & Gemmell, Hull |
| Operator | F. W. Mason, Hartlepool |
| History | PRN: HL61 |
U-boat attacks on Trawler Ostrich
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 10 Feb 1917 | U 45 (Erich Sittenfeld) | Sunk | Stopped and sunk by gunnery 135 miles off Longstone, Farne Islands | 0 |
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