| Navy | The Royal Navy |
| Type | Sloop |
| Class | Modified Black Swan |
| Pennant | U 30 |
| Built by | William Denny & Brothers (Dumbarton, Scotland) |
| Ordered | Apr 1942 |
| Laid down | 8 Sep 1942 |
| Launched | 11 Nov 1943 |
| Commissioned | 12 May 1944 |
| End service | |
| Loss position | |
| History | Sold to the West German Navy on 5 May 1959. Commanding Officers: Lt.Cdr. John Townshend Kimpton, DSC, RN |
Commands listed for HMS Mermaid (U 30)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. John Pemberton Mosse, RN | 2 Apr 1944 | Sep 1945 |
| 2 | Lt.Cdr. John Townshend Kimpton, DSC, RN | Sep 1945 | Oct 1945 ? |
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Noteable events involving Mermaid include:
24 Aug 1944
The German submarine U-354 was sunk in the Barents Sea north-east of North Cape, in position 72º49'N, 30º41'E, by depth charges from the British sloops HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) and HMS Peacock (Lt.Cdr. R.B. Stannard, VC, DSO, RD, RNR), the British frigate HMS Loch Dunvegan (Cdr. E. Wheeler, RD, RNR) and the British destroyer HMS Keppel (Cdr. I.J. Tyson, DSO, DSC, RD, RNR). (see map)
2 Sep 1944
The German submarine U-394 was sunk in the Norwegian Sea some nautical miles south-east of Jan Mayen island, Norway, in position 69º47'N, 04º10'E, by rockets and depth charges from a Swordfish aircraft (Sqdn. 825) from the British escort carrier HMS Vindex (Capt. H.T.T. Bayliss, RN), and the British destroyers HMS Keppel (Cdr. I.J. Tyson, DSO, DSC, RNR) and HMS Whitehall (Lt.Cdr. P.J. Cowell, DSC, RN) and the British sloops HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) and HMS Peacock (Lt.Cdr. R.B. Stannard, VC, DSO, RNR). (see map)