66 Anti-Aircraft Brigade was raised in the Spring of 1941 by splitting off some of the units from 50 Anti-Aircraft Brigade in 2 Anti- Aircraft Division. This left 50 Brigade as a Light Anti-Aircraft /Searchlight Brigade and 66 Anti-Aircraft Brigade with Heavy and Light Anti-Aircraft units plus an AA Z Regiment. By November 1942 the Brigade was under command of 1 Army for Operation Torch, the invasion of Algeria.
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.
| Apr 41 | Midlands |  | 2 Anti-Aircraft Division |
| Aug 42 | UK |  | War Office control |
| Nov 42 | Algeria |  | 1 Army |
| Sep 43 | Italy |  | US 5 Army |
Order of Battle 1941
| 67 Heavy Anti-Aircraft Regiment (187, 188, 189, 198 Batteries) – Left Jul 41 |
| 113 Heavy Anti-Aircraft Regiment (359, 362, 366, 391 Batteries) |
| 38 Light Anti-Aircraft Regiment (51, 124, 125, 230 Batteries) – Left Sep 42 |
| 64 Light Anti-Aircraft Regiment (191, 192, 193 Batteries) – Left Oct 41 |
| 15 AA Z Regiment (120, 180, 181 Batteries) – Left Aug 42 |
Order of Battle 1942
| 106 Heavy Anti-Aircraft Regiment (270, 327, 331, 332 Batteries) – Left May 42 |
| 113 Heavy Anti-Aircraft Regiment – Left Mar 42 |
| 144 (Mixed) Heavy Anti-Aircraft Regiment (497, 498, 503, 504 Batteries) – Joined May left Aug 42 |
| 38 Light Anti-Aircraft Regiment – Left Dec 41 |
| 45 Light Anti-Aircraft Regiment (135, 142, 265 Batteries) – Joined Dec 41, left Aug 42 |
| 44 Searchlight Regiment (302, 336, 337, 338 Batteries) – Joined Dec 41, left May 42 |
| 15 AA Z Regiment – Left Aug 42 |
Order of Battle January 1943
| Bone port & airfield |
| 59 Heavy Anti-Aircraft Regiment (164, 167, 265 Batteries) |
| 252 Battery, 80 Heavy Anti-Aircraft Regiment |
| One battery, 17 Light Anti-Aircraft Regiment |
| One battery, 63 Light Anti-Aircraft Regiment |
| 568 Battery, 30 Searchlight Regiment |
| ‘U’ AA Operations Room |
| One US AAA/CA Battalion |
| Canrobert airfield |
| One battery, 63 Light Anti-Aircraft Regiment |
Order of Battle March 1943
| Bone port & airfield |
| 59 Heavy Anti-Aircraft Regiment |
| 252 Battery, 80 Heavy Anti-Aircraft Regiment |
| One battery, 84 Heavy Anti-Aircraft Regiment |
| One battery, 58 Heavy Anti-Aircraft Regiment |
| AA Z Battery |
| Two batteries, 22 Light Anti-Aircraft Regiment |
| One battery, 30 Searchlight Regiment |
| Tabarka |
| One troop, 84 Heavy Anti-Aircraft Regiment |
| One battery, 22 Light Anti-Aircraft Regiment |
| Tingley |
| One battery, 84 Heavy Anti-Aircraft Regiment |
| One battery, 64 Light Anti-Aircraft Regiment |
May 1943
| Bone |
| 59 Heavy Anti-Aircraft Regiment |
| Two batteries, 85 Heavy Anti-Aircraft Regiment |
| Two batteries, 22 Light Anti-Aircraft Regiment |
| 124 AA Z Battery |
| One battery, 30 Searchlight Regiment |
| AA Operations Room |
| Phillippeville |
| 79 Heavy Anti-Aircraft Regiment |
| One battery, 64 Light Anti-Aircraft Regiment |
| One battery, 72 Light Anti-Aircraft Regiment |
| One battery, 30 Searchlight Regiment |
| AA Operations Room |
| Airfields |
| One battery, 85 Heavy Anti-Aircraft Regiment |
| Two batteries, 64 Light Anti-Aircraft Regiment |
| One battery, 22 Light Anti-Aircraft Regiment |
Order of Battle July 1944
| Salerno, Anzio, Airfields |
| 9 Heavy Anti-Aircraft Regiment |
| 55 Heavy Anti-Aircraft Regiment |
| 71 Heavy Anti-Aircraft Regiment |
| 12 Light Anti-Aircraft Regiment |
| 45 Light Anti-Aircraft Regiment |
| 54 AA Operations Room |
Order of Battle October 1944
| 55 Heavy Anti-Aircraft Regiment |
| 73 Heavy Anti-Aircraft Regiment |
| 79 Heavy Anti-Aircraft Regiment |
| 88 Heavy Anti-Aircraft Regiment |
| 12 Light Anti-Aircraft Regiment |
| 29 Light Anti-Aircraft Regiment |
| 535 Searchlight Battery |
| 54 AA Operations Room |
| 55 AA Operations Room |
Order of Battle January 1945
| 59 Heavy Anti-Aircraft Regiment |
| 73 Heavy Anti-Aircraft Regiment |
| 12 Light Anti-Aircraft Regiment |
| 29 Light Anti-Aircraft Regiment |
| 535 Searchlight Battery |
| 52 AA Operations Room |
|
| 55 AA Operations Room |
Order of Battle April 1945
| 59 Heavy Anti-Aircraft Regiment |
| 12 Light Anti-Aircraft Regiment |
| 13 Light Anti-Aircraft Regiment |
| 29 Light Anti-Aircraft Regiment |
| 535 Searchlight Battery |
| 54 AA Operations Room |
