73 Anti-Aircraft Brigade joined 8 Army on Sicily on 19 July 1943. On the 1 October it transferred to Allied Forces HQ troops. When the invasion of Italy took place 73 Anti-Aircraft Brigade remained on Sicily.
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.
| Jul 43 | Sicily |  | 8 Army |
| Oct 43 | Sicily |  | Allied Forces HQ |
Order of Battle August 1943
| Airfields |
| 1 Battery, 1 Heavy Anti-Aircraft Regiment |
| 31 Light Anti-Aircraft Regiment (61, 101, 224 Batteries) |
| 53 Light Anti-Aircraft Regiment (157, 158, 159 Batteries) |
| 225 Battery, 74 Light Anti-Aircraft Regiment |
| 20 AA Operations Room |
| 150 AA Operations Room |
| Catania |
| 17 Battery, 1 Heavy Anti-Aircraft Regiment |
| 304 & 321 Batteries, 100 Heavy Anti-Aircraft Regiment |
| 12 Light Anti-Aircraft Regiment (35, 36 Batteries)(34 Battery with 62 AA Bde) |
| Augusta |
| 55 Heavy Anti-Aircraft Regiment (163, 166, 307 Batteries) |
| 97 Heavy Anti-Aircraft Regiment (298, 299, 319 Batteries) |
| 236 Battery, 76 Heavy Anti-Aircraft Regiment |
| 131 Battery, 47 Light Anti-Aircraft Regiment |
| 329 Battery, 99 Light Anti-Aircraft Regiment |
| 6 AA Operations Room |
| Batteries from 3 Royal Marine Heavy Anti-Aircraft Regiment |
| Batteries from 4 Royal Marine Light Anti-Aircraft Regiment |
Order of Battle September 1943
| Milazzo, port & ferries |
| 170 & 171 Batteries, 61 Heavy Anti-Aircraft Regiment |
| 304 & 321 Batteries, 100 Heavy Anti-Aircraft Regiment |
| 117 Light Anti-Aircraft Regiment (383, 384, 385 Batteries) |
| 140 & 268 Batteries, 40 Light Anti-Aircraft Regiment |
| 41 AA Operations Room |
| Airfields |
| 88 Heavy Anti-Aircraft Regiment (276, 281, 283 Batteries) |
| 104 Heavy Anti-Aircraft Regiment (less one Battery) |
| 31 Light Anti-Aircraft Regiment (61, 101, 224 Batteries) |
| 70 Light Anti-Aircraft Regiment (208, 209, 215 Batteries) |
| 75 Light Anti-Aircraft Regiment (Less one Battery) |
| 154 AA Operations Room |
| Augusta |
| 55 Heavy Anti-Aircraft Regiment (163, 166, 307 Batteries) |
| 327 & 329 Batteries, 99 Light Anti-Aircraft Regiment |
| Batteries from 3 Royal Marine Heavy Anti-Aircraft Regiment |
| 6 AA Operations Room |
Order of Battle October 1943
| Messina & Milazzo |
| 61 Heavy Anti-Aircraft Regiment (170 & 1/2 of 171 Batteries) |
| 80 Heavy Anti-Aircraft Regiment (194, 250 Batteries) |
| 12 Light Anti-Aircraft Regiment (34, 35, 36 Batteries) |
| 47 Light Anti-Aircraft Regiment (85, 131 Batteries) |
| 18 AA Operations Room |
| Catania |
| 1 Heavy Anti-Aircraft Regiment (1, 2, 17 Batteries) |
| 31 Light Anti-Aircraft Regiment (61, 224 Batteries) |
| 535 Independent Searchlight Battery |
| 6 AA Operations Room |
| Airfields |
| 104 Heavy Anti-Aircraft Regiment (328, 329, 336 Batteries) |
| 70 Light Anti-Aircraft Regiment (208, 209, 215 Batteries) |
| 101 Battery, 31 Light Anti-Aircraft Regiment |
| 153 AA Operations Room |
| Augusta, Syracuse & Cassibile |
| 55 Heavy Anti-Aircraft Regiment (163, 166, 307 Batteries) |
| 66 Light Anti-Aircraft Regiment (175, 176, 276 Batteries) |
| 154 AA Operations Room |
Order of Battle January 1944
| Messina |
| 2 Battery, 1 Heavy Anti-Aircraft Regiment |
| 175 Battery, 66 Light Anti-Aircraft Regiment |
| 18 AA Operations Room |
| Catania |
| 80 Heavy Anti-Aircraft Regiment (194, 250 Batteries) |
| 12 Light Anti-Aircraft Regiment (35, 36 Batteries) |
| 276 Battery, 66 Light Anti-Aircraft Regiment |
| 6 AA Operations Room |
| Augusta |
| 55 Heavy Anti-Aircraft Regiment (163, 166, 307 Batteries) |
| 61 Heavy Anti-Aircraft Regiment (170, 171, 195 Batteries) |
| 73 Heavy Anti-Aircraft Regiment (209, 210, 311 Batteries) |
| 70 Light Anti-Aircraft Regiment (208, 209 Batteries) |
| 535 Independent Searchlight Battery |
| 55 AA Operations Room |
| Syracuse |
| 17 Battery, 1 Heavy Anti-Aircraft Regiment |
| 176 Battery, 66 Light Anti-Aircraft Regiment |
| Gerbini |
| 215 Battery, 70 Light Anti-Aircraft Regiment |
| Palermo |
| 1 Battery, 1 Heavy Anti-Aircraft Regiment |
| 34 Battery, 12 Light Anti-Aircraft Regiment |
