| Navy | The Royal Navy |
| Type | ASW Whaler |
| Class | Lake |
| Pennant | FY 252 |
| Built by | Smith's Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | 6 Jul 1939 |
| Launched | 31 Aug 1939 |
| Commissioned | 15 Nov 1939 |
| Lost | 19 Nov 1942 |
| Loss position | |
| History | HMS Ullswater (T/Lt. Neil Black Cameron Ross, RNR) was torpedoed and sunk by a German motor torpedo boat in the English Channel on 19 November 1942.The Commanding officer was killed in the loss. |
| Former name | Kos XXIX |
Commands listed for HMS Ullswater (FY 252)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Skr. Charles Raymond Blowers, RNR | 8 Nov 1939 | 1 Jan 1940 |
| 2 | S.Lt. Douglas Riddell Stavert, RN | 1 Jan 1940 | 17 Apr 1940 |
| 3 | Lt. Oliver Russell Moore, RN | 17 Apr 1940 | 23 Oct 1940 |
| 4 | T/Lt. Neil Black Cameron Ross, RNR | 23 Oct 1940 | 19 Nov 1942 (+) |
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