8 Anti-Aircraft Z Regiment RA was formed in September 1940 with four batteries in 9 Anti-Aircraft Division at Llanduff, Cardiff. 8 Anti-Aircraft Z Regiment RA disbanded in March 1945 and RHQ became 3 Area Anti-Aircraft Maintenance HQ.
| Sep 40 | Formed | ||
| Sep 40 |  |
9 Anti-Aircraft Division, 45 Anti-Aircraft Brigade | Cardiff, Glamorgan, UK |
| Oct 41 | |
9 Anti-Aircraft Division, 61 Anti-Aircraft Brigade | Swansea, Glamorgan, UK |
| Aug 42 | |
9 Anti-Aircraft Division, 45 Anti-Aircraft Brigade | Cardiff, Glamorgan, UK |
| Oct 42 |  |
3 Anti-Aircraft Group, 45 Anti-Aircraft Brigade | South Wales |
| Apr 44 | |
Became 8 Anti-Aircraft Area Mixed Regiment | |
| Mar 45 | Batteries disbanded Became 3 Area Anti-Aircraft Maintenance HQ |
Batteries
| Sep 40 | 111, 113, 124, 125 |
| Jan 41 | 111, 113, 124, 125, 130, 140 |
| Mar 41 | 113, 125, 130, 140 |
| Nov 41 | 113, 125, 130, 140, 186 |
| Dec 42 | 113, 125, 130, 140, 186, 222 |
| Apr 44 | 125, 140, 186, 222 |
Batteries manned by Home Guard
| Battery | Home Guard Unit | Date from |
| 113 Battery | 104 Glamorgan (Mixed) | Nov 42 |
| 125 Battery | 102 Glamorgan (Mixed) | Nov 42 |
| 130 Battery | 103 Glamorgan (Mixed) | Nov 42 |
| 140 Battery | 101 Monmouth (Mixed) | Nov 42 |
| 186 Battery | 101 Glamorgan (Mixed) | Nov 42 |
| 222 Battery | 105 Glamorgan (Mixed) | Sep 42 |