Kenneth Mackenzie, the first Lord Mackenzie of Kintail (c. 1569–1611), was a Highland clan chief who secured for himself and his heirs the entirety of the island of Lewis in the Outer Hebrides and successfully pursued a bloody feud with the Macdonells of Glengarry.
Mackenzie was the son of Colin Cam Mackenzie of Kintail (died 1594) and Barbara, daughter of John Grant of Grant. The Mackenzies were a clan from Ross-shire that had risen to prominence in the 15th century during the disintegration of the Lordship of the Isles.
On 9 November 1594, soon after his father's death, Mackenzie made oath in presence of the King and the Privy Council that he would "faithfully, loyally, and truly concur, fortify, and assist his Majesty's Lieutenant of the North with his advice and force at all times and occasions as he may be required by proclamations, missive letters, or otherwise."
Under date of 18 February 1595 – 1596, there is an entry in the records of the Privy Council that Kenneth Mackenzie of Kintail "being elected and chosen to be one of the ordinary members" of the Council, and being personally present, makes faith and gives oath in the usual manner. Mackenzie's connections to central government were to prove invaluable to him in the turbulent times that lay ahead. He proved himself to be a masterful political operator but even he had to deal with potentially serious setbacks and the Privy Council's records show that he was on at least one occasion imprisoned in Edinburgh Castle.
Mackenzie was one of the eight Lesser Barons who constituted the Lords of the Articles in the Scottish Parliament which met for the first time on 17 June 1609. Although he was raised to the peerage on 19 November 1609, by the title of Lord Mackenzie of Kintail, he was not so designated in the Privy Council Records until 31 May 1610, when the patent of his creation was read and received by their Lordships, and he was thereupon acknowledged to be a free baron in all time coming. Mackenzie's peerage accompanied his final triumph in his long campaign for the island of Lewis.