Theseus
| Name | Theseus |
| Type | Steamer |
| GRT | 6,723 tons |
| Country |  British |
| Built | 1908 |
| Builder | Workman, Clark & Co., Ltd., Belfast |
| Operator | Ocean Steam Ship Co., Ltd. (A. Holt & Co.), Liverpool |
| History | Cargo vessel fitted with passenger accommodations. |
U-boat attacks on Steamer Theseus
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Mar 1915 | U 28 (Georg-Günther von Forstner) | Damaged | 40 miles SW of Scilly by gunfire | Liverpool - Java | general cargo | 0 |
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