| Navy | The Royal Navy |
| Type | ASW Trawler |
| Class | [No specific class] |
| Pennant | FY 117 |
| Built by | Cook, Welton & Gemmill (Beverley, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 26 Jul 1937 |
| Commissioned | Sep 1939 |
| End service | |
| Loss position | |
| History | Completed on 29 September 1937 for Crampin Steam Fishing Co. Ltd., Grimsby as Barnett, GY454. Resold in July 1946 to Crampin Steam Fishing Co. Limited, Grimsbby. Once again amed Barnett, GY200. |
Commands listed for HMS Blackfly (FY 117)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. John Isdale Miller, RNR | 26 Sep 1939 | 25 Aug 1940 |
| 2 | Lt. Mervyn John Woods, RCNVR | 25 Aug 1940 | Oct 1940 |
| 3 | T/Lt. Alwyn Phillips Hughes, RNR | Oct 1940 | 30 Oct 1944 |
| 4 | Lt. Stuart Faithful Fell, RANVR | 30 Oct 1944 | Mar 1945 |
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Noteable events involving Blackfly include:
20 Oct 1940
HMS Blackfly (Lt. A.P. Hughes, RNR) picks up 37 survivors from the British tanker Shirak that is torpedoed and sunk by the German submarine U-48 about 90 nautical miles south-west of Rockall in position 57º00'N, 16º53'W.
15 May 1944
The German submarine U-731 was sunk in the mid-Atlantic near Tangier, in position 35º54'N, 05º45'W, by depth charges from the British patrol vessel HMS Kilmarnock (T/A/Lt.Cdr. K.B. Brown, RNVR), the British anti-submarine trawler HMS Blackfly (T/A/Lt.Cdr. A.P. Hughes, DSC, RNR) and 2 US Catalina aircraft (VP-63/P-12/P-1). (see map)