172 (Mixed) Heavy Anti-Aircraft Regiment RA(TA) was formed at Woodthorpe House, Nottingham in August 1942. The Regiment disbanded in April 1945 at Worlingham Hall, Beccles, Suffolk.
| Aug 42 | Formed | Nottingham, Nottinghamshire, UK |
| Aug 42 | 32 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Nottinghamshire, UK |
| Aug 43 | 63 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Nottinghamshire, UK |
| Feb 44 | 32 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Nottinghamshire, UK |
| May 44 | 65 Anti-Aircraft Brigade, 5 Anti-Aircraft Group | Nottinghamshire, UK |
| Apr 45 | Disbanded | Beccles, Suffolk, UK |
Batteries
| Sep 42 | 517 (Mixed), 570 (Mixed) |
| Oct 42 | 517 (M), 570 (M), 573 (M), 582 (M) |
| May 43 | 517 (M), 570 (M), 573 (M), 582 (M), 668 (M) |
| Aug 43 | 517 (M), 570 (M), 573 (M), 582 (M) |
| Feb 44 | 517 (M), 570 (M), 573 (M) |
| Dec 44 | 570 (M) |
