| Navy | The Royal Navy |
| Type | Destroyer |
| Class | R |
| Pennant | H 85 |
| Built by | John Brown Shipbuilding & Engineering Company Ltd. (Clydebank, Scotland) |
| Ordered | May, 1940 |
| Laid down | 20 Jun, 1941 |
| Launched | 15 Jul, 1942 |
| Commissioned | 30 Nov, 1942 |
| End service | |
| Loss position | |
| History | Reconstructed as Type 15 frigate during 1949-1951.
Scrapped in 1971. Commanding Officers: Lt.Cdr. George Baillie Barstow, RN |
| Noteable events involving Relentless include: 22 Sep, 1943 12 Feb, 1944 |
