Tonawanda
| Name | Tonawanda |
| Type | Tanker |
| GRT | 3,421 tons |
| Country |  British |
| Built | 1893 |
| Builder | Armstrong, Mitchell & Co., Ltd., Newcastle |
| Operator | Anglo-American Oil Co., Ltd., London |
| History |
U-boat attacks on Tanker Tonawanda
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Jun 1917 | UC 21 (Reinhold Saltzwedel) | Damaged | Torpedoed 10 miles W of Beachy Head | Dover - Maryport | in ballast | 0 |
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