| Navy | The Royal Navy |
| Type | ASW Whaler |
| Class | Lake |
| Pennant | FY 239 |
| Built by | Smith's Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | 7 Jul 1939 |
| Launched | 31 Aug 1939 |
| Commissioned | 7 Nov 1939 |
| End service | |
| Loss position | |
| History | Sold in May 1946. |
| Former name | HMS Grassmere, Kos XXVIII |
Commands listed for HMS Wastwater (FY 239)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. John Jackson, RNR | late 1939 | 14 Feb 1940 |
| 2 | T/Lt. William Wilkinson White, RNR | 14 Feb 1940 | late 1940 |
| 3 | T/Lt. Alistair Cameron Munro, RNVR | late 1940 | 12 Feb 1941 |
| 4 | T/Lt. Robert Edwards, RNVR | 12 Feb 1941 | Aug 1941 |
| 5 | T/Lt. John Henry Louis May, OBE, RNVR | Aug 1941 | Apr 1943 |
| 6 | T/Lt. William John Lewis Storey, RNVR | Apr 1943 | 13 Jul 1945 |
| 7 | T/Lt. Andrew Miller Anderson, RNVR | 13 Jul 1945 | late 1945 |
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