553 Coast Regiment RA was formed as 15 Coast Artillery Group RA at Worthing with five batteries, in October 1940. It was re-designated 553 Coast Regiment RA in June 1941. RHQ was disbanded in April 1944 and the batteries dispersed.
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 15 Coast Artillery Group | Worthing, Sussex, UK | |
| Oct 40 |  |
Eastern Command | Worthing, Sussex, UK |
| Jun 41 | Became 553 Coast Regiment | ||
| Apr 44 | Disbanded |
Batteries
| May 41 | 238, 344, 345, 346, 359 |
| Jun 41 | 149, 238, 344, 345, 346, 359 |
| May 42 | 149, 344, 345, 346, 359, 403 |
| Sep 42 | 149, 175, 344, 345, 346, 403 |
| Nov 42 | 149, 344, 345, 346, 403 |