| Navy | The Royal Indian Navy |
| Type | Sloop |
| Class | Black Swan |
| Pennant | U 21 |
| Built by | William Denny & Brothers (Dumbarton, Scotland) |
| Ordered | 8 Sep 1939 |
| Laid down | 20 Feb 1940 |
| Launched | 16 Nov 1940 |
| Commissioned | 13 May 1941 |
| End service | |
| Loss position | |
| History | |
Commands listed for HMIS Jumna (U 21)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Cdr. Walter Richard Shewring, RIN | Nov 1940 | 16 Apr 1942 |
| 2 | Cdr. Jesser Evelyn Napier Coope, RIN | 16 Apr 1942 | 1 Dec 1942 |
| 3 | A/Cdr. Ivan Bryan Warburton Heanly, RIN | 1 Dec 1942 | ear/mid44 |
| 4 | A/Cdr. Hugh Murray Clark, RIN | ear/mid44 | 28 Aug 1944 |
| 5 | A/Cdr. Killingworth Richard Utten Todd, RIN | 28 Aug 1944 | 16 May 1945 |
| 6 | A/Lt.Cdr. Jacques Frederick Bayliss, RIN | 16 May 1945 | 18 Jul 1945 |
| 7 | T/Cdr. Harold Auby Tod, RINR | 18 Jul 1945 | 21 Jan 1946 |
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