Sebastian
| Name | Sebastian |
| Type | Steamer |
| GRT | 2,563 tons |
| Country |  Spanish |
| Built | 1892 |
| Builder | Sir Raylton Dixon & Co., Middlesbrough |
| Operator | F. Sainz & Inchaustegui, Bilbao |
| History |
U-boat attacks on Steamer Sebastian
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Feb 1918 | U 152 (Constantin Kolbe) | Sunk | SW of Madeira | 29° 11'N, 19° 15'W | Torrevieja - New York | salt | 0 |
Position of attack on Sebastian
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