Opal
| Name | Opal |
| Type | Steamer |
| GRT | 599 tons |
| Country |  British |
| Built | 1894 |
| Builder | Scott & Sons, Bowling |
| Operator | Wm. Robertson, Glasgow |
| History |
U-boat attacks on Steamer Opal
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 18 Dec 1916 | U 80 (Alfred von Glasenapp) | Sunk | off Isle of Man | Llandulas - Belfast & Glasgow | limestone | 12 |
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