Lieutenant General Sir Robert Andrew Magowan, is a senior Royal Marines officer who serves as the Deputy Chief of the Defence Staff since May 2022. He previously served as Commandant General Royal Marines from 2016 to 2017 and again from 2021 to 2022.

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.