Thyholmen
| Name | Thyholmen |
| Type | Auxiliary motor |
| GRT | 259 tons |
| Country |  Norwegian |
| Built | 1913 |
| Builder | Fredrikshavns Skibsvft & Flydk., Fredrikshavn |
| Operator | A/S Thyholm (O. & V. Kallevig), Arendal |
| History | Four-masted schooner fitted with an auxiliary motor. |
U-boat attacks on Auxiliary motor Thyholmen
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Nov 1916 | UB 41 (Friedrich Karl Sichart von Sichartshofen) | prize | near Blyth | Holmestrand - West Hartlepool | pitprops | 0 | |
| Taken as prize and retained. | ||||||||
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