| Navy | The Royal Navy |
| Type | ASW Whaler |
| Class | Lake |
| Pennant | FY 206 |
| Built by | Smith's Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | 20 May 1939 |
| Launched | 5 Jul 1939 |
| Commissioned | 27 Oct 1939 |
| End service | |
| Loss position | |
| History | Sold on 24 May 1946. |
| Former name | Kos XXVI |
Commands listed for HMS Thirlmere (FY 206)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Skr. John Main, RNR | 16 Oct 1939 | 16 Dec 1939 |
| 2 | Cdr. (retired) Frederic Thornton Peters, DSO, DSC, RN | 16 Dec 1939 | mid 1940 |
| 3 | S.Lt. John Cromwell Varley, RN | mid 1940 | 16 Oct 1940 |
| 4 | T/S.Lt. Arthur Marchant Brown, RNVR | 16 Oct 1940 | 18 Dec 1940 |
| 5 | Reginald Charles Robert Mortimore, RNVR | 18 Dec 1940 | May 1941 |
| 6 | T/Lt. Philip Geoffrey Colet King, RNVR | May 1941 | early 1942 |
| 7 | A/Skr.Lt. John Main, RNR | early 1942 | 27 Mar 1942 |
| 8 | T/Lt. Philip Geoffrey Colet King, RNVR | 27 Mar 1942 | mid 1943 |
| 9 | T/Lt. Srewart Robert Andrew, RNVR | mid 1943 | 26 Jul 1943 |
| 10 | L J A Gradewell, RNVR | 26 Jul 1943 | 24 Mar 1944 |
| 11 | T/Lt. Brian Vincent Dowling, RNVR | 24 Mar 1944 | May 1944 |
| 12 | K Thelfson, RNR | May 1944 | 11 Feb 1945 |
| 13 | T/Lt. Harold Olaf Olsen, RNR | 11 Feb 1945 | late 1945 |
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