Casa Blanca
| Name | Casa Blanca |
| Type | Sailing vessel |
| GRT | 31 tons |
| Country |  Portuguese |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Casa Blanca
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 7 Sep 1917 | UB 49 (Hans von Mellenthin) | Sunk | Stopped and sunk 12 miles off Larache | 35° 09'N, 6° 35'W |
Position of attack on Casa Blanca
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