Greltoria
| Name | Greltoria |
| Type | Steamer |
| GRT | 5,143 tons |
| Country |  British |
| Built | 1917 |
| Builder | Northumberland SB. Co., Ltd., Newcastle |
| Operator | Griffiths Lewis Stm. Nav. Co., Ltd. (J. C. Gould & Co.), Ltd.), Cardiff |
| History |
U-boat attacks on Steamer Greltoria
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 Sep 1917 | UB 34 (Hellmuth von Ruckteschell) | Sunk | 3 miles NWxN1/2N of Flamborough Head | Tyne - Naples | coal | 0 |
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