Ministry of Home Security

The Ministry of Home Security was a British government department established in 1939 to direct national civil defence during the Second World War, and primarily tasked with organising air raid precautions (ARP). It was at first headed by Sir John Anderson, the Home Secretary and Minister of Home Security. The ministry's responsibilities covered all central and regional civil defence organisations, such as air raid wardens, rescue squads, fire services, and the Women's Voluntary Service. It was also responsible for giving approval to local ARP schemes and providing public shelters.

The Ministry, run under the auspices of the Home Office, produced hundreds of leaflets or handbills and booklets that were delivered to the population and advised on how to deal with impending air raids or gas attack. It also managed propaganda poster campaigns, such as to encourage the carrying of gas masks and to encourage volunteers to join civil defence groups like the Fire Guards.

In October 1940, Sir John Anderson was replaced by Herbert Morrison in a reshuffle that was precipitated by Neville Chamberlain's resignation owing to ill health.

With the Allied victory in Europe, the Ministry was disbanded in May 1945.