| Navy | The Royal Navy |
| Type | Corvette |
| Class | Flower |
| Pennant | K 16 |
| Built by | William Simons & Co. Ltd. (Renfrew, Scotland) |
| Ordered | 25 Jul 1939 |
| Laid down | 21 Sep 1939 |
| Launched | 23 Apr 1940 |
| Commissioned | 24 Jun 1940 |
| End service | |
| Loss position | |
| History | Transferred to the Royal Danish navy on 8 September 1945 being renamed Thetis. Commanding Officers: T/Lt. Arthur Robert James Tilston, DSC, RNR T/Lt. George Wallace, RNR T/Lt. Charles Blackshaw, RNVR HMS Geranium is not listed as active unit in the October 1945 Navy List |
Commands listed for HMS Geranium (K 16)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | T/Lt. Alan Foxall, RNR | 2 May 1940 | 13 Mar 1943 |
| 2 | T/Lt. Arthur Robert James Tilston, SANF(V) | 13 Mar 1943 | 28 Jan 1944 |
| 3 | T/Lt. George Wallace, RNR | 28 Jan 1944 | 28 Oct 1944 |
| 4 | T/Lt. Charles Blackshaw, RNVR | 28 Oct 1944 | Jul 1945 ? |
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Noteable events involving Geranium include:
31 Oct 1943
The German submarine U-306 was sunk in the North Atlantic north-east of the Azores, in position 46º19'N, 20º44'W, by depth charges from the British destroyer HMS Whitehall (Lt.Cdr. C.L.de H. Bell, RD, RNR) and the British corvette HMS Geranium (T/Lt. A.R.J. Tilston, DSC, RNR). (see map)