101 Anti-Aircraft Regiment RA(TA) was formed at Inverness in August 1939. It was re-designated as 101 Heavy Anti-Aircraft Regiment RA(TA) in June 1940. The Regiment was placed in suspended animation in December 1945 and reconstituted as 501 Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Aug 39 | 36 Anti-Aircraft Brigade, 3 Anti-Aircraft Division | Inverness, UK |
| Jun 41 | 51 Anti-Aircraft Brigade, 3 Anti-Aircraft Division | North East Scotland |
| Jun 42 | 56 Anti-Aircraft Brigade, 6 Anti-Aircraft Division | South East England |
| Aug 42 | 35 Anti-Aircraft Brigade, 5 Anti-Aircraft Division | Southern England |
| Sep 42 | 26 Anti-Aircraft Brigade, 1 Anti-Aircraft Division | London, UK |
| Jan 43 | War Office Reserve | UK |
| Jul 43 | 3 Indian Anti-Aircraft Brigade | Avadi, India |
| Oct 43 | 1 Royal Marine Anti-Aircraft Brigade | Bombay, India |
| Jan 44 | 14 Army | India |
| Apr 44 | 9 Anti-Aircraft Brigade | India |
| Sep 44 | 33 Indian Corps | Imphal, India |
| Jun 45 | 24 Anti-Aircraft Brigade | Burma (Myanmar) |
| Sep 45 | Disbanded | Rangoon, Burma (Myanmar) |
Batteries
| Aug 39 | 226, 297 |
| Jan 40 | 226, 297, 317 |
| Jun 41 | 226, 297, 379 |
| Aug41 | 226, 297, 379, 427 |
| Jul 42 | 226, 297, 379 |
| Jul 45 | 226, 297 |
