The Muir Mackenzie Baronetcy, of Delvine in the County of Perth, is a title in the Baronetage of the United Kingdom. It was created on 9 November 1805 for Alexander Muir Mackenzie. Born Alexander Muir, he had assumed the additional surname of Mackenzie on succeeding to the estates of his great-uncle John Mackenzie, of Delvine, Perthshire, third son of Sir Kenneth Mackenzie, 1st Baronet, of Coul (see Mackenzie Baronets).
Kenneth Muir Mackenzie, 1st Baron Muir Mackenzie, was a younger son of the second Baronet.