522 (Dorsetshire) Coast Regiment RA (TA) was formed from part of the Dorsetshire Heavy Regiment RA (TA), in July 1940. RHQ and the Fire Command were converted to 618 Infantry Regiment RA (TA) in January 1945. 618 Regiment was placed in suspended animation in January 1946 and 522 (Dorsetshire) Coast Regiment RA (TA) was reconstituted as 421 (Dorset) 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 Dorsetshire Heavy Regiment | Weymouth, Dorset, UK | |
| Jul 40 | Portland Fire Command | Weymouth, Dorset, UK | |
| Apr 42 |  |
5 Corps | Weymouth, Dorset, UK |
| Jan 43 |  |
1 Canadian Corps | Portland, Dorset, UK |
| Jun 43 | Sussex District CAHQ | Portland, Dorset, UK | |
| Apr 44 | Hants & Dorset District | Portland, Dorset, UK | |
| Jan 45 | RHQ became 618 Infantry Regiment RA |
Batteries
| Jul 40 | A, B, C, D, E, F |
| Dec 40 | A, B, C, D, E, F, 387 |
| Apr 41 | 102 (East Weare), 103 (Blacknor), 104 (Breakwater), 105 (Nothe Fort), 106 (Portland B Pier), 107 (Portland C Pier), 387 (Abbotsbury) |
| Jun 41 | 102, 103, 104, 105, 106, 107, 134 (Upton), 239 (West Bay), 387 |
| Dec 41 | 102, 103, 104, 105, 106, 107, 134 – 31 & 57 Coast Observer Detachments |
| Jul 42 | 102, 103, 104, 105, 106, 107, 134 – 31, 57 & 98 Coast Observer Detachments |
| Feb 43 | 102, 103, 104, 105, 106, 107, 134, 239 (West Bay), 376 (Lyme Regis), 387 – 27, 57 & 98 Coast Observer Detachments |
| Mar 43 | 102, 103, 104, 105, 106, 107, 134, 239, 387 |
Equipment
| 2 x 5.5 inch Guns | West Bay (Bridport Harbour) | 239 Battery |
| 4 x 9.2 inch Guns 4 x 6 inch Guns 4 x 12 pdr Guns |
Portland | 106 Battery 107 Battery |
| 2 x 4.7 inch Guns | Poole | |
| 2 x 4.7 inch Guns | Lyme Regis | |
| 2 x 4.7 inch Guns | Swanage | |
| 2 x 4 inch Guns | Abbotsbury | 387 Battery |