66 (Lowland) Medium Regiment RA (TA) was formed as a duplicate of 57 Medium Regiment with two batteries in 1939. It served in the UK until May 1943 when it moved to North Africa. It went on to fight in Sicily and Italy. The Regiment was placed in suspended animation in March 1946. 66 (Lowland) Medium Regiment RA (TA) was disbanded in January 1947.
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.
(Title granted February 1942)
| Sep 39 |  |
Scottish Command | Prestonpans, East Lothian, UK |
| Sep 39 |  |
5 Corps | UK |
| Jan 40 | |
5 Corps | UK (cadre taken to form 71 Medium Regiment) |
| Dec 41 |  |
Eastern Command | UK |
| Dec 42 |  |
War Office Control | UK |
| Mar 43 |  |
Middle East Forces | N Africa |
| Jul 43 |  |
8 Army, 6 Army Group RA | N Africa |
| Jul 43 | |
8 Army, 6 Army Group RA | Sicily |
| Sep 43 |  |
6 Army Group RA | Italy |
| May 44 | |
6 Army Group RA | Cassino , Italy |
Batteries
| Sep 39 | 227 (Haddingtonshire), 228 (Peebleshire & Midlothian) |
Equipment
| Mar 40 | 6 inch Howitzers |
| May 43 | One Battery each of 4.5 inch & 5.5 inch Guns |