HMS E21 was a British E class submarine built by Vickers, Barrow-in-Furness. She was laid down on 29 July 1915 and was commissioned on 1 October 1915. HMS E21 was sold on 14 December 1921.
| Identifier (URI) | Rank |
|---|---|
| dbkwik:resource/FzcdH5V_2UnSWPtn3bOQvQ== | 5.88129e-14 |
| dbr:HMS_E21 | 5.88129e-14 |
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