Harmonides
| Name | Harmonides |
| Type | Steamer |
| GRT | 3,521 tons |
| Country |  British |
| Built | 1891 |
| Builder | Wigham Richardson & Co., Newcastle |
| Operator | British & South American Steam Nav. Co., Ltd. (R. P. Houston & Co.), Liverpool |
| History |
U-boat attacks on Steamer Harmonides
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Jan 1918 | UC 71 (Ernst Steindorff) | Damaged | Torpedoed off St. Catherine’s Point | London - Newport | in ballast | 0 |
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