Theodor
| Name | Theodor |
| Type | Sailing vessel |
| GRT | 234 tons |
| Country |  Norwegian |
| Built | 1855 |
| Builder | Yeo & Co., Prince Edwards Island |
| Operator | A/S Livlig (Bjørnstad & Co.), Kristiania |
| History |
U-boat attacks on Sailing vessel Theodor
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Oct 1916 | UB 22 (Bernhard Putzier) | Sunk | 56.35N, 03.30E | Moss – West Hartlepool | pitprops | 0 |
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