Alnwick Castle
| Name | Alnwick Castle |
| Type | Passenger steamer |
| GRT | 5,900 tons |
| Country |  British |
| Built | 1901 |
| Builder | W. Beardmore & Co., Glasgow |
| Operator | Union-Castle Mail Steamship Co., Ltd., London |
| History |
U-boat attacks on Passenger steamer Alnwick Castle
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Mar 1917 | U 81 (Raimund Weisbach) | Sunk | 310 miles W1/2S of Bishop Rock | 47.38N, 13.24W | . London - Table Bay | general cargo & passengers | 40 |
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