81 Light Anti-Aircraft Regiment RA (TA) was formed in August 1941 at Boxted with two batteries. The Regiment served in the UK with Anti-Aircraft command for the entire war. 81 Light Anti-Aircraft Regiment RA (TA) was disbanded in October 1945 in the UK.
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 49 & 69 Light Anti-Aircraft Regiments |
Boxted, Essex, UK | |
| Aug 41 |  |
6 Anti-Aircraft Division, 29 Anti-Aircraft Brigade | London, UK |
| Mar 42 |  |
5 Anti-Aircraft Division, 65 Anti-Aircraft Brigade | Southampton, UK |
| May 42 |  |
12 Anti-Aircraft Division, 42 Anti-Aircraft Brigade | Glasgow, UK |
| Oct 42 |  |
7 Anti-Aircraft Group, 3 Anti-Aircraft Brigade | Belfast, UK |
| Oct 45 | Disbanded |
Batteries
| Aug 41 | 199, 261 |
| Sep 41 | 199, 261, 307 |
| Feb 42 | 199, 261, 307, 455, 472 |
| May 42 | 199, 261, 307, 472 |
| Jun 42 | 199, 261, 307 |
| Jul 44 | 199, 261 |
| Aug 45 | 199 |