Master corporal (MCpl) (French: caporal-chef) is a military rank used by a number of countries including the Canadian Armed Forces.

According to the Queen's Regulations and Orders:[1] Master corporal, while formally an appointment, is treated as a de facto non-commissioned member rank, and is often described as such, even in official documents.

The rank insignia of a master corporal is a two-bar chevron, worn point down, surmounted by a maple leaf.

A power vacuum was inadvertently created when private soldiers were promoted to the rank of corporal as an incentive for continuing in the Forces at a time when Unification was introduced by Defence Minister Paul Hellyer, who promoted all privates with requisite time in service to what was originally a leadership rank (corporal) in the Army.

Given the structure of the Canadian infantry platoon, the MCpl is roughly equivalent to the British rank of corporal, second in command of an infantry section; due to the fact that MCpls often command sections and occupy various NCO positions, as well as the fact that trained leadership is retained at a lower level (section) than in other militaries, it is more realistic to equate MCpls with the British, Australian and New Zealand rank of senior corporal and just under sergeant.

In addition, to be appointed to master corporal an infantry soldier must have successfully completed a machine gunner's specialization course.