101 Anti-Aircraft Brigade was formed in April 1943 at Clacton, Essex. The following month it moved to Kirklington, Nottinghamshire. In September it moved again to Margate in Kent. A month later it was in Broadstairs, Kent and Heathfield, Sussex by December.
The Brigade landed in Normandy on the 19/20th of August on Utah beach. They then moved inland to Cherbourg. In September they were relieved and moved to Brussels under GHQ AA Troops. They left Brussels and moved up to the Rhine in April 1945. When the war in Europe ended the Brigade moved to the Schleswig area on occupation duties. 101 Anti-Aircraft Brigade disbanded in October 1945.
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 43 | Formed Clacton, Essex | Home Forces | |
| Aug 44 | Cherbourg, France |  | 21 Army Group |
| Sep 44 | Brussels, Belgium | | 21 Army Group |
| Apr 45 | Rhine, Germany | | 21 Army Group |
| Jun 45 | Schleswig, Germany | | 21 Army Group |
| Oct 45 | Disbanded |
Order of Battle September 1944
Cherbourg
| 99 Heavy Anti-Aircraft Regiment (302, 303, 318 Batteries) |
| 105 Heavy Anti-Aircraft Regiment (326, 330, 333 Batteries) |
| 116 Heavy Anti-Aircraft Regiment (341, 363, 364 Batteries) |
| 4 (Royal Marine) Light Anti-Aircraft Regiment (22, 25, 26 Batteries) |
| 109 Light Anti-Aircraft Regiment (357, 358, 359 Batteries) |
| 474 Searchlight Battery less one troop |
Order of Battle September 1944
Brussels
| 105 Heavy Anti-Aircraft Regiment |
| 116 Heavy Anti-Aircraft Regiment |
| 4 Light Anti-Aircraft Regiment (7, 8, 10 Batteries) |
| 474 Searchlight Battery |
| 367 Battery, 42 Searchlight Regiment |
Order of Battle October 1944
Brussels
| 98 Heavy Anti-Aircraft Regiment |
| 103 Heavy Anti-Aircraft Regiment (322, 323, 324 Batteries) |
| 105 Heavy Anti-Aircraft Regiment |
| 116 Heavy Anti-Aircraft Regiment |
| 1 (Royal Marine) Heavy Anti-Aircraft Regiment (A, B, C, D Batteries) |
| 4 Light Anti-Aircraft Regiment |
| 20 Light Anti-Aircraft Regiment (62, 63 Batteries) |
| 41 Searchlight Regiment |
| 474 Searchlight Battery |
| 367 Battery, 42 Searchlight Regiment |
Order of Battle November 1944
Brussels
| 86 Heavy Anti-Aircraft Regiment (273, 274, 383 Batteries) |
| 103 Heavy Anti-Aircraft Regiment |
| 105 Heavy Anti-Aircraft Regiment |
| 116 Heavy Anti-Aircraft Regiment |
| 1 (Royal Marine) Heavy Anti-Aircraft Regiment |
| 4 Light Anti-Aircraft Regiment |
| One battery 73 Light Anti-Aircraft Regiment |
| 54 Searchlight Regiment (411, 412, 413 Batteries) |
| 474 Searchlight Battery |
| 367 Battery, 42 Searchlight Regiment |
Order of Battle December 1944
Brussels
| 103 Heavy Anti-Aircraft Regiment |
| 105 Heavy Anti-Aircraft Regiment |
| 116 Heavy Anti-Aircraft Regiment |
| 4 Light Anti-Aircraft Regiment |
| 73 Light Anti-Aircraft Regiment less one battery |
| One battery 41 Searchlight Regiment |
Order of Battle April 1945
| 115 Heavy Anti-Aircraft Regiment (361, 365, 367 Batteries) |
| 272 Battery, 90 Heavy Anti-Aircraft Regiment |
| 4 Light Anti-Aircraft Regiment less one battery |
| 20 Light Anti-Aircraft Regiment (62, 63 Batteries) |
| 93 Light Anti-Aircraft Regiment less one battery |
| 42 Searchlight Regiment (367, 368 Batteries -366 Bty detached) |
| One troop 364 Battery, 41 Searchlight Regiment |