The 103rd Heavy Anti-Aircraft Regiment was an air defence unit of the British Army's Royal Artillery during World War II. It saw action during the Liverpool Blitz, landed on D-Day and served throughout the subsequent campaign in North West Europe and defended the cities of Belgium against V-1 flying bombs.

The 33rd (Western) Anti-Aircraft Brigade was an air defence formation of Anti-Aircraft Command of the Territorial Army, part of the British Army, formed shortly before the outbreak of the Second World War. It defended Merseyside and West Lancashire during The Blitz.