| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | Halcyon |
| Pennant | J 99 |
| Built by | Ailsa Shipbuilding Co. Ltd. (Troon, Scotland) : Thornycroft (Southampton, U.K.) |
| Ordered | |
| Laid down | 12 Dec 1936 |
| Launched | 6 Oct 1937 |
| Commissioned | 9 Jun 1938 |
| End service | |
| Loss position | |
| History | Sold 3 September 1946. Commanding Officers: Lt.Cdr. Douglas Henry Fryer, RN Cdr. Reginald Ernest Terry, RN Cdr. Herbert Guy Abbott Lewis, RN A/Cdr. Trevor George Payne Crick, DSC and Bar, RN A/Lt.Cdr. Harry Layland Dudley Hoare, RNR |
Commands listed for HMS Jason (J 99)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Cdr. Alun Jones, RN | 1 Apr 1939 | 28 Sep 1939 |
| 2 | Douglas Henry Fryer, RN | 28 Sep 1939 | 21 Jun 1940 |
| 3 | Reginald Ernest Terry, RN | 21 Jun 1940 | 14 Oct 1942 |
| 4 | Herbert Guy Abbott Lewis, RN | 14 Oct 1942 | 5 Jan 1944 |
| 5 | Trevor George Payne Crick, RN | 5 Jan 1944 | 25 Dec 1944 |
| 6 | Harry Layland Dudley Hoare, RNR | 25 Dec 1944 | Oct 1945 ? |
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Noteable events involving Jason include:
25 Sep 1940
HMS Jason (Lt.Cdr. R.E. Terry, RN) picks up 18 survivors from the British merchant Mabriton that was torpedoed and sunk by the German submarine U-32 west-south-west of Rockall in position 56º12'N, 23º00'W.
19 Oct 1940
HMS Jason (Lt.Cdr. R.E. Terry, RN) picks up 39 survivors from the Dutch merchant Bilderdijk that was torpedoed and sunk in the North Atlantic in position 56º35'N, 17º15'W by the German submarine U-38.
HMS Jason also picks up 40 survivors from the British merchant Uganda that was torpedoed and sunk in the North Atlantic in position 56º35'N, 17º15'W by the German submarine U-47.
20 Oct 1940
HMS Jason (Lt.Cdr. R.E. Terry, RN) picks up 111 survivors from the British merchant Loch Lomond that was torpedoed and sunk by the German submarine U-100 south-west of Rockall in position 56º00'N, 14º30'W.