Mar Terso
| Name | Mar Terso |
| Type | Steamer |
| GRT | 3,778 tons |
| Country |  Italian |
| Built | 1893 |
| Builder | Richardson, Duck & Co., Stockton |
| Operator | M. Maresca & Co., Genoa |
| History |
U-boat attacks on Steamer Mar Terso
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 May 1916 | U 39 (Walter Forstmann) | Sunk | off Baleares | 39° 08'N, 5° 02'E | Newport - Savona | coal | 0 |
Position of attack on Mar Terso
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