Monarch
| Name | Monarch |
| Type | Fishing Vessel (Smack) |
| GRT | 35 tons |
| Country |  British |
| Built | 1903 |
| Builder | S. J.Dewdney |
| Operator | J. Whicher & C. Hellings, Milford Haven |
| History | Fishing registration: BM 215 |
U-boat attacks on Fishing Vessel (Smack) Monarch
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Feb 1917 | UC 66 (Herbert Pustkuchen) | Sunk | Stopped and sunk 14 miles SExS of Eddystone | 0 |
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