Luisa
| Name | Luisa |
| Type | Steamer |
| GRT | 3,603 tons |
| Country |  Spanish |
| Built | 1897 |
| Builder | Russell & Co., Port Glasgow |
| Operator | Hijos de José Taya, S. en C., Barcelona |
| History |
U-boat attacks on Steamer Luisa
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Apr 1918 | UB 74 (Ernst Steindorff) | Sunk | Torpedoed and sunk 6 miles WxS of the Pendeen LH | 50° 07'N, 5° 49'W | Barcelona - Liverpool | general cargo | 0 |
Position of attack on Luisa
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