Vice-Admiral George Mackenzie (died 1780) was a Royal Navy officer who served as Commander-in-Chief, The Nore from 1774 to 1775.
Mackenzie became commanding officer of the frigate HMS Amazon in July 1745 and then of the frigate HMS Tavistock in August 1745.
He went on to command the fifth-rate HMS Renown and saw action in the Raid on St Malo in June 1758, the invasion of Martinique in January 1759 and the invasion of Guadeloupe in spring 1759.
After that he was given command of the fourth-rate HMS Defiance and took part in the siege of Havana in spring 1762.
[1] He was appointed Rear-Admiral of the Red in January 1778[2] and Vice-Admiral of the Blue in March 1779.