| Navy | The Royal Canadian Navy |
| Type | Corvette |
| Class | Castle |
| Pennant | K 488 |
| Built by | Smith's Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | 23 Jun 1943 |
| Launched | 28 Dec 1943 |
| Commissioned | 4 May 1944 |
| End service | 22 Nov 1945 |
| Loss position | |
| History | Decommissioned 22 November 1945. Commanding Officers: T/A/Lt.Cdr. Berkeley Hynes, RCNVR |
| Former name | HMS Sandgate Castle |
Commands listed for HMCS St. Thomas (K 488)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Leslie Perman Denny, RCNR | 4 May 1944 | 26 Jan 1945 |
| 2 | Berkeley Hynes, RCNVR | 27 Jan 1945 | Oct 1945 ? |
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Noteable events involving St. Thomas include:
27 Dec 1944
The German submarine U-877 was sunk in the North Atlantic north-west of the Azores, in position 46º25'N, 36º38'W, by Squid foreward-throwing weapon of the Canadian corvette HMCS St. Thomas (A/Lt.Cdr. L.P. Denny, RCNR). (see map)