11 Medium Regiment RA was formed in December 1942 from 9th Battalion The Essex Regiment. It was organised with two batteries. In January 1946 the Regiment was disbanded.
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 42 | Formed from 9th Battalion The Essex Regiment | UK | |
| Dec 42 | Home Forces | UK | |
| May 44 |  |
21 Army Group | UK |
| Jun 44 | |
21 Army Group, 9 Army Group RA | NW Europe |
Batteries
| Dec 42 | P, Q |
| Jan 43 | 85, 86 |