The 4th Battalion, Queen's Royal Regiment was a volunteer unit of the British Army from 1859 to 1961. Beginning from small independent units recruited in the South London suburbs, it was attached to the Queen's Royal Regiment and served in the Second Boer War, the First World War, and the Third Anglo-Afghan War. Before the Second World War, it was converted into a Royal Artillery searchlight regiment that served in the Battle of Britain and The Blitz. Later it became a light anti-aircraft gun unit serving on blockships in the Mulberry harbour during the Normandy invasion, and then defended the port of Antwerp in the closing stages of the war. Postwar it continued in the air defence role before rejoining the Queen's Regiment as infantry.

The Queen's Royal Regiment (West Surrey) was a line infantry regiment of the English and later the British Army from 1661 to 1959. It was the senior English line infantry regiment of the British Army, behind only the Royal Scots in the British Army line infantry order of precedence.