4th Anti-Aircraft Division var en brittisk luftvärnsdivision som sattes upp den 1 september 1938. Ursprungligen täckte divisionen området runt Birmingham, men senare flyttades den för att täcka områdena runt Manchester och Liverpool. Divisionen lydde under Western Command under andra världskriget.
Enheter 33rd (Western) Anti-Aircraft Brigade (formerad 01.11.36) 70th (3rd West Lancashire) Anti-Aircraft Regiment 93rd Anti-Aircraft Regiment 62nd (The Loyal) Searchlight Regiment 34th (South Midland) Anti-Aircraft Brigade (formerad 01.04.38) 69th (The Royal Warwickshire Regiment) Anti-Aircraft Regiment 73rd Anti-Aircraft Regiment 95th Anti-Aircraft Regiment 44th Anti-Aircraft Brigade (formerad 29.09.38) 65th (The Manchester Regiment) Anti-Aircraft Regiment 39th (The Lancashire Fusiliers) Anti-Aircraft Battalion 71st (East Lancashire) Searchlight Regiment 53rd Light Anti-Aircraft Brigade (formerad 24.08.39) 15th (Ilse of Man) Light Anti-Aircraft Regiment 21st Light Anti-Aircraft Regiment 25th Light Anti-Aircraft Regiment 33rd Light Anti-Aircraft Regiment 54th Anti-Aircraft Brigade (formerad 01.09.39) 41st (5th North Staffordshire Regiment) Anti-Aircraft Battalion 45th (The Royal Warwickshire Regiment) Anti-Aircraft Battalion 59th (Warwickshire) Searchlight Regiment 61st (South Lancashire Regiment) Searchlight Regiment
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