155 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was formed in Dumbarton in March 1942. The Regiment served in Anti-Aircraft Command until moving to Antwerp, Belgium in March 1945. 155 (Mixed) Heavy Anti-Aircraft Regiment RA (TA) was disbanded in October 1945.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Mar 42 | Formed | Dumbarton, Dunbartonshire, UK | |
| Mar 42 |  |
12 Anti-Aircraft Division, 57 Anti-Aircraft Brigade | Glasgow, UK |
| Aug 42 | |
12 Anti-Aircraft Division, 42 Anti-Aircraft Brigade | Glasgow, UK |
| Feb 43 |  |
1 Anti-Aircraft Group, 48 Anti-Aircraft Brigade | South East England |
| Sep 44 | |
1 Anti-Aircraft Group, 37 Anti-Aircraft Brigade | South East England |
| Mar 45 |  |
21 Army Group, 50 Anti-Aircraft Brigade | Antwerp, Belgium |
| Oct 45 | Disbanded |
Batteries
| May 42 | 525 (Mixed), 528 (Mixed), 531 (Mixed), 537 (Mixed) |
| Jul 42 | 525 (M), 528 (M), 531 (M), 537 (M), 554 (M) |
| Sep 42 | 525 (M), 531 (M), 537 (M) |
| Nov 42 | 525 (M), 531 (M), 579 (M) |