Portia
| Name | Portia |
| Type | Fleet messenger |
| GRT | 494 tons |
| Country |  British |
| Built | 1906 |
| Builder | Mackay Bros., Alloa |
| Operator | Royal Navy |
| History | Peace-time operator: South Wales & Liverpool SS. Co., Ltd. (R. Gilchrist & Co.), Liverpool |
U-boat attacks on Fleet messenger Portia
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Aug 1915 | U 28 (Georg-Günther von Forstner) | Sunk | 70 miles south of the Scillies | 0 |
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