Marmora
| Name | Marmora |
| Type | Armed merchant cruiser |
| GRT | 10,509 tons (one of the largest ships hit) |
| Country |  British |
| Built | 1903 |
| Builder | Harland & Wolff, Ltd., Belfast |
| Operator | Royal Navy |
| History | Pecae-time operator: Peninsular & Oriental Steam Navigation Co., Belfast |
U-boat attacks on Armed merchant cruiser Marmora
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Jul 1918 | UB 64 (Otto von Schrader) | Sunk | S of Ireland | 50.24N, 08.48W | Cardiff - Dakar | 10 |
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