Sir George Mackenzie, 4th Baronet (c. 1702–1748), of Cromarty and Grandvale, was a Scottish politician who sat in the British House of Commons from 1729 to 1734.
[1] Mackenzie also succeeded his father as Member of Parliament for Cromartyshire being returned at a by-election on 25 March 1729.
He was an independent, voting with the Administration on the army in 1732, but against them on the Excise Bill in 1733 and the repeal of the Septennial Act in 1734.
At the time of the 1745 Jacobite rebellion he stayed loyal, although his cousin, George Mackenzie, 3rd Earl of Cromartie, joined the rising.
The baronetcies then devolved upon the succession of the 3rd Earl of Cromartie, who had been executed for treason and fell under attainer and thus became extinct.