175th Heavy Anti-Aircraft Regiment, Royal Artillery was an air defence unit of the British Army formed during World War II. It served in defence of the vital naval and air base at Gibraltar.

82nd (Essex) Heavy Anti-Aircraft Regiment, Royal Artillery, was a volunteer air defence unit of Britain's Territorial Army (TA) from 1938 until 1955. During World War II it served in the Norwegian Campaign, defended Gibraltar and the D-Day invasion ports, and took part in Operation Diver against the V-1 flying bombs.