Pontoporos
| Name | Pontoporos |
| Type | Steamer |
| GRT | 4,049 tons |
| Country |  Greek |
| Built | 1913 |
| Builder | W. Doxford & Sons, Ltd., Sunderland |
| Operator | National Steam Nav. Co., Ltd. of Greece (Embiricos Bros.), Andros |
| History |
U-boat attacks on Steamer Pontoporos
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 Aug 1917 | UC 21 (Werner von Zerboni di Sposetti) | Sunk | off Glenans Island | 47° 33'N, 3° 15'W | Tyne - La Spezia | coal |
Position of attack on Pontoporos
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