Kong Oscar Ii
| Name | Kong Oscar Ii |
| Type | Sailing vessel |
| GRT | 842 tons |
| Country |  Norwegian |
| Built | 1892 |
| Builder | J. Brandt, Kragerø |
| Operator | Heinrich Biørn jr., Kragerø |
| History | Wooden bark. |
U-boat attacks on Sailing vessel Kong Oscar Ii
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Apr 1917 | UB 38 (Wilhelm Amberger) | Sunk | Seine estuary 30 miles NWxW of Cape de la Hève | Le Havre – Barbados | in ballast | 0 |
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