18 Medium Regiment RA was formed in November 1943 by the re-designation of RHQ 18 Defence Regiment as RHQ L Medium Regiment RA. In January 1944 it embarked for North Africa and was re-designated 18 Medium Regiment RA. It was joined by its two Batteries. The Regiment disbanded in February 1945, 254 Battery going to suspended animation.
| Nov 43 | Formed from HQ 18 Defence Regiment RA as RHQ L Medium Regiment |
UK |
| Nov 43 | Home Forces | UK |
| Jan 44 | Re-designated RHQ 18 Medium Regiment | |
| Mar 44 | GHQ Troops | N Africa |
| Feb 45 | Disbanded |
Batteries
| Mar 44 | 254, 255 |
