118 Heavy Anti-Aircraft Regiment RA (TA) was formed at Larkhill Practice Camp in December 1940. The Regiment served in Anti-Aircraft Command until March 1944. It had moved to France by September 1944. 118 Heavy Anti-Aircraft Regiment RA (TA) was disbanded in January 1946.
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.
| Dec 40 | Formed | Larkhill, Wiltshire, UK | |
| Dec 40 |  |
5 Anti-Aircraft Division, 35 Anti-Aircraft Brigade | Portsmouth, Hampshire, UK |
| May 41 |  |
9 Anti-Aircraft Division, 45 Anti-Aircraft Brigade | Cardiff, Glamorgan, UK |
| Apr 43 | Unbrigaded | UK | |
| Mar 44 |  |
2 Army | UK |
| Sep 44 |  |
21 Army Group, 5 Royal Marine Anti-Aircraft Brigade | Antwerp, Belgium |
Batteries
| Dec 40 | 373, 374, 375 |
| Sep 41 | 373, 374, 375, 275 |
| Jul 42 | 373, 374, 375, 399 |