| Navy | The Royal Navy |
| Type | ASW Trawler |
| Class | [No specific class] |
| Pennant | FY 234 |
| Built by | Cook, Welton & Gemmill (Beverley, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 19 Aug 1936 |
| Commissioned | Nov 1939 |
| Lost | 11 Apr 1942 |
| Loss position | 33.09N, 78.16W (See a map) |
| History | Completed on 2 October 1936. Lent to the United States Navy in February 1942 to operate of the US East coast under USN control. HMT St. Cathan (Lt. John Mackay, RNR) was sunk in a collision with the Dutch merchant Hebe south-south-east of Little River, South Carolina, U.S.A. in position 33.09'N, 78.16'W. |
Commands listed for HMS St. Cathan (FY 234)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Ch.Skr. Charles William Freer, RNR | 1 Nov 1939 | 27 Mar 1940 |
| 2 | T/Lt. Frederick Twomey, RNR | 27 Mar 1940 | 12 Jun 1941 |
| 3 | Lt. John Mackay, RNR | 12 Jun 1941 | 11 Apr 1942 |
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