Augusto De Castilho
| Name | Augusto De Castilho |
| Type | Navy Trawler |
| GRT | 487 tons |
| Country |  Portuguese |
| Built | 1909 |
| Builder | Cochrane & Sons, Selby |
| Operator | Portuguese Navy |
| History | Peace-time operator: Parceria Geral de Pescarias (Bensaude & Co.), Lisbon |
U-boat attacks on Navy Trawler Augusto De Castilho
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 14 Oct 1918 | U 139 (Lothar von Arnauld de la Perière) | Sunk | 100 miles SW of the Azores | Madeira – Azores | |||
| While escorting the steamer San Miguel. | ||||||||
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