USS San Diego
| Name | USS San Diego |
| Type | Armored cruiser |
| GRT | 13,680 tons (one of the largest ships hit) |
| Country |  American |
| Built | 1904 |
| Builder | Union Iron Works, San Francisco |
| Operator | U.S. Navy |
| History |
U-boat attacks on Armored cruiser San Diego
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Jul 1918 | U 156 (Richard Feldt) | Sunk | Mined 10 miles off Fire island, New York | 6 |
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