81 Light Anti-Aircraft Regiment RA(TA) was formed in August 1941 at Boxted with two batteries. The Regiment was disbanded in October 1945 in the UK.
| Aug 41 | Formed from batteries from 49 & 69 Light Anti-Aircraft Regiments |
Boxted, Essex, UK |
| Aug 41 | 29 Anti-Aircraft Brigade, 6 Anti-Aircraft Division | UK |
| Mar 42 | 65 Anti-Aircraft Brigade, 5 Anti-Aircraft Division | UK |
| May 42 | 42 Anti-Aircraft Brigade, 12 Anti-Aircraft Division | Glasgow, UK |
| Oct 42 | 3 Anti-Aircraft Brigade, 7 Anti-Aircraft Group | 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 |
