Madrugada
| Name | Madrugada |
| Type | Auxiliary motor |
| GRT | 1,613 tons |
| Country |  American |
| Built | 1917 |
| Builder | McEachern Ship Co., Astoria, OR |
| Operator | Gravenhorst & Co., New York |
| History | Wooden 4-masted schooner with an auxiliary engine. |
U-boat attacks on Auxiliary motor Madrugada
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 15 Aug 1918 | U 117 (Otto Dröscher) | Sunk | 35 miles off Norfolk | 37.50N, 74.55W | New York - Santos | 0 |
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