Isidoro
| Name | Isidoro |
| Type | Steamer |
| GRT | 2,044 tons |
| Country |  Spanish |
| Built | 1897 |
| Builder | Craig, Taylor & Co., Stockton |
| Operator | Echevarrieta y Larrinaga, Bilbao |
| History |
U-boat attacks on Steamer Isidoro
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 Aug 1915 | U 38 (Max Valentiner) | Sunk | 17 miles ESE of Tuskar | Bilbao - Glasgow | iron ore | 0 |
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