MI11, or Military Intelligence, Section 11, was a department of the British Directorate of Military Intelligence, part of the War Office. During the Second World War, MI11 was responsible for

field security Field may refer to: Expanses of open ground * Field (agriculture), an area of land used for agricultural purposes * Airfield, an aerodrome that lacks the infrastructure of an airport * Battlefield * Lawn, an area of mowed grass * Meadow, a ...

: protecting British military personnel from enemy agents and " fifth columnists" amongst civilian populations, in theatres of war. As such, MI11 assumed a role formerly assigned to the Field Security Police (which had itself replaced the British Army's Intelligence unit before World War I). Section 11 was disbanded after World War II.

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574 FIELD SECURITY SECTION OF 3 SPECIAL SERVICE BRIG
Groups of World War II Security Defunct United Kingdom intelligence agencies Military communications of the United Kingdom War Office in World War II British intelligence services of World War II {{UK-mil-stub