HMY Aegusa
| Name | HMY Aegusa |
| Type | Navy yacht |
| GRT | 1,242 tons |
| Country |  British |
| Built | 1896 |
| Builder | Scott & Co., Greenock |
| Operator | Royal Navy |
| History | Peace-time operator: Sir Thomas Lipton as Erin. |
U-boat attacks on Navy yacht Aegusa
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Apr 1916 | U 73 (Gustav Sieß) | Sunk | Mined off Malta | 6 |
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