84 Light Anti-Aircraft Regiment RA (TA) was formed in August 1941 at Glasgow with four batteries. The Regiment served in the UK for the whole of its existence. 84 Light Anti-Aircraft Regiment RA (TA) was disbanded in April 1945 at Lerwick, Shetland Islands.
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.
| Aug 41 | Formed from batteries from 40, 66, 67 & 68 Light Anti-Aircraft Regiments |
Glasgow, UK | |
| Aug 41 | Home Forces | UK | |
| Dec 41 |  |
12 Anti-Aircraft Division, 63 Anti-Aircraft Brigade | West Scotland, UK |
| Jun 42 | |
12 Anti-Aircraft Division, 3 Anti-Aircraft Brigade | Northern Ireland, UK |
| Oct 42 |  |
9 Anti-Aircraft Division | UK |
| Apr 45 | Disbanded | Shetlands, UK |
Batteries
| Aug 41 | 177, 201, 205, 251 |
| Jul 42 | 201, 251, 448, 461 |
| Dec 43 | 251 |