George Mackenzie (1741 – 4 June 1787) was a British Army officer who commanded the 2nd battalion of the 73rd Highlanders during the Great Siege of Gibraltar.

He was one of the twelve children of George Mackenzie, 3rd Earl of Cromartie.

His father was found guilty of treason and sentenced to death for raising a Jacobite regiment, but then pardoned.

Masckenzie, Charles Holloway, Thomas Trigge, General William Green and George Koehler are amongst those recorded as the principal officers serving in the siege when it was painted by George Carter for the City of London.

[3] Mackenzie died in Walajabad from a fever on 4 June 1787 and was buried there the same day without a wife or children.