91 Light Anti-Aircraft Regiment RA was formed in November 1941 by conversion of 12th Battalion The South Staffordshire Regiment, with three batteries . The Regiment was disbanded in December 1945 .
| Nov 41 | Formed from 12th Battalion South Staffordshire Regiment | |
| Nov 41 | Home Forces | UK |
| Jan 42 | 4 Infantry Division | UK |
| Mar 43 | 4 Infantry Division | N Africa |
| Feb 44 | 4 Infantry Division | Italy |
| Apr 44 | Allied Forces HQ | Italy |
| Jun 44 | 4 Infantry Division | Italy |
| Dec 44 | Disbanded |
Batteries
| Nov 41 | 314, 315, 316 |
