539 Coast Regiment RA was formed at Southampton with three batteries, in January 1941. RHQ with 350 & 417 Batteries disbanded in March 1943 and the remaining batteries joined 529 Coast Regiment RA(TA).
| Jan 41 | Formed | Southampton, Hampshire, UK |
| Jan 41 | Home Forces | UK |
| Mar 43 | Disbanded |
Batteries
| Jan 41 | 165, 209, 417 |
| Mar 42 | 165, 209, 350, 417 |
| Jun 42 | 165, 183, 209, 350, 417 |
| Feb 43 | 165, 183, 209, 350, 376, 417 |
| Mar 43 | 165, 183, 209, 350, 417 |
