Royal Ordnance Factories (ROFs) were munitions factories run by the UK government during and after the Second World War. The three main types of factories were engineering, filling and explosives, and these were dispersed across the country for security reasons. ROFs were the responsibility of the Ministry of Supply and later the Ministry of Defence until privatisation in 1987.

The Royal Arsenal, Woolwich is an establishment on the south bank of the River Thames in Woolwich in south-east London, England, that was used for the manufacture of armaments and ammunition, proofing, and explosives research for the British armed forces. It was originally known as the Woolwich Warren, having begun on land previously used as a domestic warren in the grounds of a mid-16th century Tudor house, Tower Place. Much of the initial history of the site is linked with that of the Office of Ordnance, which purchased the Warren in the late 17th century in order to expand an earlier base at Gun Wharf in Woolwich Dockyard.