Quartermaster Sergeant Instructor

Quartermaster Sergeant Instructor (QMSI) is an appointment held by Warrant Officers Class 2 in the British Army's Small Arms School Corps and Army Physical Training Corps and by some in the Royal Engineers.

It is also the title used within the Territorial Army for the attached regular NCO (usually a Colour Sergeant/Staff Sergeant) responsible for unit administration and stores at sub-unit level (i.e. company/squadron).