Avenger
| Name | Avenger |
| Type | Armed merchant cruiser |
| GRT | 13,441 tons (one of the largest ships hit) |
| Country |  British |
| Built | 1915 |
| Builder | Fairfield SB. & Eng. Co., Ltd., Glasgow |
| Operator | Royal Navy |
| History | Peace-time operator: Union Steamship Co. of New Zealand, Ltd., London as AOTEAROA. |
U-boat attacks on Armed merchant cruiser Avenger
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 14 Jun 1917 | U 69 (Ernst Wilhelms) | Sunk | West of the Shetland Islands | 60.22N, 04.35W | 1 |
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