The unit formed in 1900 as 23 Brigade-Division Royal Field Artillery becoming 23 Brigade Royal Field Artillery in 1903. The Brigade was re-designated as 23 Field Brigade RA in June 1924. In May 1938, 23 Field Regiment RA was re-designated from 23 Field Brigade on a two battery basis. This was done by linking the four existing batteries. It re-organised as three batteries in February 1941, with 60, 89 & 90 Batteries. 100 Battery was converted to anti-tank. Post war 23 Field Regiment RA was re-designated 64 Training Regiment RA in April 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.
| 3 Sep 39 |  |
3 Infantry Division | Exeter, Devon, UK |
| Sep 39 | |
3 Infantry Division | France |
| Mar 40 |  |
51 Infantry Division | France Captured and reformed |
| Jan 41 |  |
24 Independent Brigade Group | UK |
| Feb 41 |  |
48 Infantry Division | UK |
| Dec 41 |  |
77 Infantry Division | Devon, UK |
| Dec 42 |  |
1 Army | N Africa |
| Jul 43 |  |
Allied Forces HQ | N Africa |
| Sep 43 |  |
2 Army Group RA | Salerno, Italy (Served with 2 AGRA at various times in Italy) |
| Sep 43 |  |
8 Army | Italy |
| Apr 44 |  |
6 South African Armoured Division | Italy |
| May 44 | |
8 Army | Cassino, Italy |
Batteries
| Apr 22 | 60, 89, 90, 100 |
| May 38 | 60/100, 89/90 |
| Feb 41 | 60, 89, 90 |