Gemma
| Name | Gemma |
| Type | Steamer |
| GRT | 1,385 tons |
| Country |  British |
| Built | 1904 |
| Builder | Flensburger Schiffbau Ges., Flensburg |
| Operator | The Admiralty (Everett & Newbigin), London |
| History |
U-boat attacks on Steamer Gemma
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Oct 1917 | UB 21 (Walter Scheffler) | Sunk | 5 miles NxW from Flamborough Head | Blyth - London | coal | 4 |
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