Costanza
| Name | Costanza |
| Type | steamer |
| GRT | 2,545 tons |
| Country |  Italian |
| Built | 1883 |
| Builder | Oswald, Mordaunt & Co., Southampton |
| Operator | Soc. Anon. Marit. “La Platense” (G. Palazio, mgr.) |
| History |
U-boat attacks on steamer Costanza
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 14 Aug 1917 | UC 63 (Karsten von Heydebreck) | Sunk | 3.5 miles SExE1/2E of Inner Dowsing LV | Tyne - Livorno | coal | 0 |
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