555 Coast Regiment RA was formed as 17 Coast Artillery Group RA at Honiton with four batteries, in October 1940. It was re-designated 555 Coast Regiment RA in June 1941. RHQ was disbanded in April 1944 and the batteries joined 556 Coast Regiment RA.
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.
| Oct 40 | Formed as 17 Coast Artillery Group | Honiton, Devon, UK | |
| Oct 40 |  |
Southern Command | Honiton, Devon, UK |
| Jun 41 | Became 555 Coast Regiment | Honiton, Devon, UK | |
| Apr 44 | Disbanded |
Batteries
| Oct 40 | 376, 377 (Exmouth), 388 (Seaton), 389 |
| Dec 41 | 377, 388, 389 (Connaught Gardens) |
| May 42 | 377, 378 (Ness House), 388, 389, 390 |
| Jun 42 | 377, 378, 388, 389, 395 (Dawlish) |
| Aug 42 | 362, 377, 388, 389, 395 |
| Nov 42 | 362, 377, 389, 395, 402 (Seaton) |