Roelfina
| Name | Roelfina |
| Type | Sailing vessel |
| GRT | 148 tons |
| Country |  Dutch |
| Built | 1913 |
| Builder | G. van de Werf, Stadskanaal |
| Operator | H. Holwerda, Gasselternijveen |
| History | Steel-hulled schooner |
U-boat attacks on Sailing vessel Roelfina
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Jul 1917 | UC 21 (Werner von Zerboni di Sposetti) | prize | off Schouwen Bank | 0 | |||
| Taken as prize and retained | ||||||||
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