4 Heavy Anti-Aircraft Regiment RA was originally 4 Anti-Aircraft Brigade RA and was re-designated as 4 Anti-Aircraft Regiment RA in May 1938. It became 4 Heavy Anti-Aircraft in June 1940. In April 1947 4 Heavy Anti-Aircraft Regiment RA became 50 Heavy Anti-Aircraft Regiment RA.
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.
| Sep 39 | Home Forces | Bulford, Wiltshire, UK | |
| Nov 39 | GHQ BEF, 3 Anti-Aircraft Brigade | Le Havre, France | |
| Feb 40 | GHQ BEF, 4 Anti-Aircraft Brigade | Aubigny, France | |
| Apr 40 | GHQ BEF, 4 Anti-Aircraft Brigade | Arras, France | |
| May 40 | GHQ BEF, 4 Anti-Aircraft Brigade | Dunkirk, France | |
| Jun 40 |  |
1 Anti-Aircraft Division, 26 Anti-Aircraft Brigade | London, UK |
| Jul 41 |  |
HQRA, 10 Anti-Aircraft Brigade | Malta |
| Jun 44 |  |
Middle East Forces, 17 Anti-Aircraft Brigade | Suez Canal, Egypt |
Batteries
| Sep 39 | 3 LAA, 5, 16, 18, 27 |
| Feb 40 | 1, 3 LAA, 5 |
| May 40 | 1, 3 LAA, 27 |
| Jul 40 | 5, 6, 18 |
| Jul 41 | 5, 6, 182 |
| Sep 41 | 5, 6 |
| Jun 43 | 5, 6, 14 RMA |
Equipment
| Feb 40 | 1 & 3 Batteries – 3 inch Guns, 5 Battery – 3.7 inch Guns, Matador Tractors |
| Jun 40 | 3.7 inch Guns |