MI11

{{Short description|Department of British military intelligence (historical)}}

{{Other uses|MI-11 (disambiguation)}}

{{Use dmy dates|date=February 2025}}

{{Use British English|date=December 2014}}

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: 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 the First World War).

Section 11 was disbanded after the Second World War.