110 Heavy Anti-Aircraft Regiment RA(TA) was formed in Anglesey in October 1940. The Regiment was disbanded in February 1946.
| Oct 40 | Formed | Anglesey, Gwynedd, UK |
| Oct 40 | 34 Anti-Aircraft Brigade, 11 Anti-Aircraft Division | UK |
| May 41 | Orkney & Shetland Defences (OSDEF) | Orkney, UK |
| Dec 43 | 103 Anti-Aircraft Brigade | Cornwall, UK |
| Mar 44 | 103 Anti-Aircraft Brigade, 21 Army Group | Wiltshire, UK |
| Jun 44 | 103 Anti-Aircraft Brigade | Essex, UK |
| Sep 44 | 2 Army | Normandy, France |
| Oct 44 | 103 Anti-Aircraft Brigade | Dieppe, France |
| Mar 45 | 103 Anti-Aircraft Brigade | Antwerp, Belgium |
Batteries
| Nov 40 | 345, 346, 348, 354 |
| Sep 41 | 339, 345, 346, 348, 354 |
| Feb 42 | 345, 346, 348, 354 |
| Oct 42 | 345, 346, 354 |
