Diadem
| Name | Diadem |
| Type | Steamer |
| GRT | 3,752 tons |
| Country |  British |
| Built | 1906 |
| Builder | Richardson, Duck & Co., Stockton |
| Operator | Hall Bros. SS. Co., Ltd. (Hall Bros.), Newcastle |
| History |
U-boat attacks on Steamer Diadem
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Feb 1916 | U 38 (Max Valentiner) | Sunk | 56 miles SExS of Porquerolles Island | 42° 10'N, 6° 24'E | Marseille - Port Said | in ballast | 0 |
Position of attack on Diadem
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