Monarch
| Name | Monarch |
| Type | Cable vessel |
| GRT | 1,122 tons |
| Country |  British |
| Built | 1883 |
| Builder | David J. Dunlop & Co., Port Glasgow |
| Operator | H. M. Postmaster General - Telegraph Dept. |
| History |
U-boat attacks on Cable vessel Monarch
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 Sep 1915 | UC 5 (Herbert Pustkuchen) | Sunk | Mined 2,5 miles S Folkestone | 3 |
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