Formed as Y Field Regiment RA in May 1942 with three batteries by the re-designation of RHQ 83 Anti-Tank Regiment. In June 1942 it was re-designated 165 Field Regiment RA. By September it was down to a single battery until April 1943, when it returned to three batteries. It was disbanded in December 1944.
| May 42 | Formed as Y Field Regiment from 83 Anti-Tank Regiment | Persia (Iran) |
| May 42 | 26 Indian Infantry Brigade | Persia (Iran) |
| Jun 42 | Became 165 Field Regiment | Persia (Iran) |
| Jul 42 | 26 Indian Infantry Brigade | N Africa |
| Aug 42 | Middle East Forces | N Africa |
| May 43 | 231 Infantry Brigade | N Africa |
| Jul 43 | 231 Infantry Brigade | Sicily |
| Sep 43 | 8 Army | Italy |
| May 44 | 8 Army | Cassino, Italy |
| Dec 44 | Disbanded |
Batteries
| May 42 | 224, 463, 486 |
| Jul 42 | 224 Battery returns to 83 Anti-Tank Regiment, 463 Battery to 104 RHA |
| Apr 43 | 64, 188, 486 |
