Mar Baltico
| Name | Mar Baltico |
| Type | Steamer |
| GRT | 2,023 tons |
| Country |  Spanish |
| Built | 1899 |
| Builder | Campbeltown SB. Co., Campbeltown |
| Operator | Cia. Maritima del Nervion (Urquijo y Aldecoa), Bilbao |
| History |
U-boat attacks on Steamer Mar Baltico
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Mar 1918 | UB 55 (Ralph Wenninger) | Sunk | western Channel | 49° 17'N, 5° 05'W | Port Talbot - Bilbao |
Position of attack on Mar Baltico
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