523 (Cornwall) Coast Regiment RA (TA) was formed from part of the Cornwall Heavy Regiment RA (TA), in July 1940. The Regiment was placed in suspended animation in March 1946. 523 (Cornwall) Coast Regiment RA (TA) was reconstituted as 409 (Cornwall) Coast Regiment RA (TA) in January 1947.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Jul 40 | Formed from Cornwall Heavy Regiment | Pendennis Castle, Cornwall, UK | |
| Jul 40 | Falmouth Fire Command | Falmouth, Cornwall, UK | |
| Jan 42 |  |
8 Corps | Falmouth, Cornwall, UK |
| Mar 46 | Suspended animation |
Batteries
| Jul 40 | A (Half Moon), B (St Anthony) |
| Dec 40 | A, B, 394 (Penzance), 395 (St Ives) |
| Apr 41 | A, 108 (St Anthony), 216 (Half Moon), 394, 395 |
| Jul 41 | 108, 173 (St Mawes), 216, 300, 394, 395 |
| Aug 41 | 108, 173, 190 (St Mawes), 216, 394, 395 – 26 & 63 Coast Observer Detachments |
| Apr 42 | 108, 173, 190, 216, 394, 395, 400 (Toll Point) |
| Jun 42 | 108, 173, 190, 216, 390 (St Ives), 394, 400 |
| Aug 42 | 108, 173, 190, 216, 390, 392 (Penzance), 400 |
| Oct 42 | 108, 173, 185 (Pendennis), 216, 390, 392, 400 |
| May 43 | 108, 173, 216, 390, 392, 400, 442 (Pendennis) |
| Jun 45 | 173, 216, 390, 392, 400, 442 |
| Mar 46 | Suspended animation |
Equipment
| 4 x 6 inch Guns | Pendennis Castle | A & B Batteries |
| 2 x 4 inch Guns (replaced by French 138 mm) | St Ives | 395 Battery |
| 2 x 138 mm Guns from French Battleships | St Ives | 390 Battery |
| 2 x 12 pdr Guns (Nov 43 changed for Bofors 40 mm) | Pendennis | 442 Battery |
| Naval 2 inch Rocket Projectors | Pendennis | 442 Battery |
| Naval 2 inch Rocket Projectors | Penzance | 392 Battery |
| Bofors 40 mm AA Guns | St Anthony | 108 Battery & 216 Battery |
| Bofors 40 mm AA Guns | Toll Point | 400 Battery |