155 (Mixed) Heavy Anti-Aircraft Regiment RA(TA) was formed in Dumbarton in March 1942. The Regiment was disbanded in October 1945.
| Mar 42 | Formed | Dumbarton, Dunbartonshire, UK |
| Mar 42 | 57 Anti-Aircraft Brigade, 12 Anti-Aircraft Division | Glasgow, UK |
| Aug 42 | 42 Anti-Aircraft Brigade, 12 Anti-Aircraft Division | Glasgow, UK |
| Feb 43 | 48 Anti-Aircraft Brigade, 1 Anti-Aircraft Group | South East England |
| Sep 44 | 37 Anti-Aircraft Brigade, 1 Anti-Aircraft Group | South East England |
| Mar 45 | 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) |
