The Marine Corps Brevet Medal, also known as the Brevet Medal, was a military decoration of the United States Marine Corps; it was created in 1921 as a result of Marine Corps Order Number 26. The decoration was a one-time issuance and retroactively recognized living Marine Corps officers who had received a brevet rank. The similar practice of frocking continues in all six branches of the U.S. Armed Forces.

Brevet promotions were used by the United States military in some capacity from 1775 until they were discontinued in 1900. The Army was the only branch authorized to grant brevets until 1814, when the Marine Corps was granted the same privilege. Over 86 years, the Marine Corps awarded 121 brevet promotions to 100 Marine Corps officers. Captain Anthony Gale was the first to receive a brevet promotion in 1814, and John Twiggs Myers, who died in 1952, was the last surviving recipient.

In 1921, Commandant John A. Lejeune requested that a Marine Corps Brevet Medal be authorized. After it was approved and created, the decoration was given to the last 20 living Marine Corps officers who received brevet promotions.