| Navy | The Royal Navy |
| Type | Submarine |
| Class | S |
| Pennant | P 226 |
| Built by | Scotts Shipbuilding & Engineering Co. (Greenock, Scotland) |
| Ordered | |
| Laid down | 24 Apr 1941 |
| Launched | 26 Mar 1943 |
| Commissioned | 20 Sep 1943 |
| End service | |
| Loss position | |
| History | Scrapped at Boness on 31 May 1965. Commanding Officers: Lt.Cdr. Aston Dalzell Piper, DSO, DSC and 2 Bars, RD, RNR |
Commands listed for HMS Sirdar (P 226)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. John Anthony Spender, RN | 21 Jun 1943 | 8 Aug 1945 |
| 2 | Lt.Cdr. Aston Dalzell Piper, DSC, RD, DSO, RNR | 8 Aug 1945 | 23 Nov 1945 |
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Noteable events involving Sirdar include:
8 Jun 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks a Japanese sailing vessel with gunfire in the Strait of Malacca.
11 Jun 1944
HMS Sirdar (Lt. J.A. Spender, RN) damages a Japanese coaster with gunfire north of Sumatra.
18 Jul 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks a Japanese sailing vessel with gunfire off the west coast of Siam.
21 Jul 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks two Japanese coasters with gunfire off the west coast of Siam.
1 Sep 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks a small Japanese vessel with gunfire north-west of Sumatra.
2 Sep 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks the Japanese guardboat Kaiyo Maru No.5 (93 GRT) with gunfire about 17 nautical miles south-east of Meulaboh, Sumatra, Netherlands East Indies in position 03º55'N, 96º20'E. (see map)
25 Dec 1944
HMS Sirdar (Lt. J.A. Spender, RN) sinks a Japanese vessel with gunfire off Surabaya, Java, Netherlands East Indies.
1 Feb 1953
Sirdar was swamped by floods while in dry dock at the naval dockyard at Sheerness, Kent, and later sank.