Nicolaos
| Name | Nicolaos |
| Type | Sailing vessel |
| GRT | 104 tons |
| Country |  Greek |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Nicolaos
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Sep 1917 | UC 23 (Volkhard von Bothmer) | Sunk | Aegean | ||||
| or NICHOLAS | ||||||||
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