Constantin
Photo courtesy of Danish Maritime Museum, Elsinore
| Name | Constantin |
| Type | Steamer |
| GRT | 831 tons |
| Country |  Danish |
| Built | 1880 |
| Builder | Kockums Mek. Verks. A/B, Malmö |
| Operator | Det Forende Dampskibs Selsk., Copenhagen |
| History |
U-boat attacks on Steamer Constantin
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 Jul 1918 | UB 123 (Robert Ramm) | prize | Skagerrak | ||||
| Taken as prize but released later | ||||||||
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