Topaz
| Name | Topaz |
| Type | Steamer |
| GRT | 696 tons |
| Country |  British |
| Built | 1896 |
| Builder | Scott & Sons, Bowling |
| Operator | Wm. Robertson, Glasgow |
| History |
U-boat attacks on Steamer Topaz
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Mar 1917 | UB 18 (Claus Lafrenz) | Sunk | 27 miles ExN1/2N of Cape Barfleur | 49° 50'N, 0° 40'W | Honfleur - Port Talbot | in ballast | 3 |
Position of attack on Topaz
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