| Navy | The Royal Navy |
| Type | ASW Trawler |
| Class | [No specific class] |
| Pennant | FY 306 |
| Built by | Cochrane & Sons Shipbuilders Ltd. (Selby, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 20 Nov 1937 |
| Commissioned | Jul 1940 |
| End service | |
| History | Completed in 9 March 1938. Returned to her owner in November 1945. |
Commands listed for HMS Haarlem (FY 306)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | T/Lt. Leslie Bertram Merrick, RNR | Jul 1940 | 24 Sep 1942 |
| 2 | Lt. Harry Riding, RNR | 24 Sep 1942 | Jan 1943 |
| 3 | T/Lt. James Reginald Turner Broom, RNVR | Jan 1943 | late 1943 |
| 4 | T/Lt. Donald Arthur King, RNVR | late 1943 | 29 Jul 1944 |
| 5 | T/Lt. Desmond D'Arcy Hay Kerr, RNVR | 29 Jul 1944 |
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Noteable events involving Haarlem include:
19 Oct 1941
HMS Haarlem (Lt. L.B. Merrick, RNVR) picks up one survivor from the British tanker Inverlee that was torpedoed and sunk by German U-boat U-204 30 nautical miles 240° from Cape Spartel, Morocco.