Diadem
| Name | Diadem |
| Type | Steamer
|
| GRT | 4,307 tons |
| Country |  British |
| Built | 1916
|
| Builder | Sunderland SB. Co., Ltd., Sunderland
|
| 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 | 21 Apr 1917 | U 50 (Gerhard Berger) | Sunk | 200 miles SWxW of Fastnet. 49.10N, 11.10W per KTB
| 48° 37'N, 12° 40'W
| Bassein & Dakar - London
| rice
| 0
|
Position of attack on Diadem
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