General Sir Lewis Stratford Tollemache Halliday, was an English Royal Marine officer and a recipient of the Victoria Cross, the highest award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces.

The Commandant General Royal Marines is the professional head of the Royal Marines. The title has existed since 1943. The role is held by a General who is assisted by a Deputy Commandant General, with the rank of brigadier. This position is not to be confused with Captain General Royal Marines, the ceremonial head. The Commandant General Royal Marines is the counterpart to the Commandant of the United States Marine Corps.