61 Anti-Aircraft Brigade was created in November 1940 in the newly formed 9 Anti-Aircraft Division. It was created by splitting off part of 45 Anti-Aircraft Brigade and was responsible for the defence of Swansea and Milford Haven.
On re-organisation in October 1942 61 Anti-Aircraft Brigade became part of 3 Anti-Aircraft Group based at Bristol.
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.
| Nov 40 | Swansea & Milford Haven |  | 9 Anti-Aircraft Division |
| Oct 42 | Bristol |  | 3 Anti-Aircraft Group |
Order of Battle 1940-41
| 79 (Hertfordshire Yeomanry) Heavy Anti-Aircraft Regiment (246, 247, 248 Batteries) |
| 34 Light Anti-Aircraft Regiment (part) |
| 1 Searchlight Regiment (part) |
Order of Battle 1941-42
| 52 (London) Heavy Anti-Aircraft Regiment (154, 155, 271 Batteries) – joined Summer 41, left Jan 42 |
| 57 (Wessex) Heavy Anti-Aircraft Regiment (213, 214, 215, 219 Batteries) – Joined May 42, left Jun 42 |
| 79 (Hertfordshire Yeomanry) Heavy Anti-Aircraft Regiment – Left Jun 42 |
| 112 Heavy Anti-Aircraft Regiment (351, 352, 353, 380 Batteries) – Joined May 42 |
| 120 Heavy Anti-Aircraft Regiment (381, 384, 386 Batteries) – Joined Jan 41, left Autumn 41 |
| 138 Heavy Anti-Aircraft Regiment (419, 424, 438, 474 Batteries) – Joined Nov 41, left Aug 42 |
| 34 Light Anti-Aircraft Regiment (92, 246 Batteries) – Left Autumn 41 |
| 50 Light Anti-Aircraft Regiment (58, 93, 245 Batteries) – Joined Jun 42 |
| 80 Light Anti-Aircraft Regiment (66, 76, 295 Batteries) – Joined Dec 41, left Apr 42 |
| 112 (Durham Light Infantry) Light Anti-Aircraft Regiment (364, 365, 366, 367 Batteries) – Joined May 1942, left Summer 1942 |
| 1 Searchlight Regiment (1, 2, 7, 8 Batteries) – Left Jan 42 |
| 77 Searchlight Regiment (494, 495, 496, 497 Batteries) – Joined May 41 |
| 8 Anti-Aircraft Z Regiment (113, 125, 130, 140, 186 Batteries) – Joined Autumn 41, left Aug 42 |
