George Mackenzie, 2nd Earl of Seaforth (died 1651) was a Highland clan chief and Scottish nobleman, who played an equivocating role in Scotland in the Wars of the Three Kingdoms.
Mackenzie was the son of Kenneth Mackenzie, 1st Lord Mackenzie of Kintail (died 1611), and Isobel, the daughter of Sir Gilbert Ogilvie of Powrie. 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 the death in 1633 of his elder half-brother Colin without male heirs, Mackenzie inherited his estates and the title of Earl of Seaforth. Prior to that point, he was known as George Mackenzie of Kildun.
As a result of the acquisitive proclivities of Seaforth’s ancestors, his estates were very extensive.
In 1633 he was "served heir male to his brother … in the lands and barony of Ellandonnan, including the barony of Lochalsh, in which was included the barony of the lands and towns of Lochcarron, namely, the towns and lands of Auchnaschelloch, Coullin (Coulin), Edderancharron, Attadill, Ruychichan, Brecklach, Achachoull, Dalmartyne, with fishings in salt water and fresh, Dalcharlarie, Arrinachteg (Arineckaig), Achintie, Slumba (Slumbay), Doune, Stromcarronach (Strome Carronach), in the Earldom of Ross, of the old extent of £13 6s 8d, and also the towns of Kisserin, and lands of Strome, with fishings in salt and fresh water, and the towns and lands of Torridan with the pertinents of the Castle of Strome; Lochalsh, Lochcarron, and Kisserin, including the davach of Achvanie, the davach of Achnatrait (Achintraid?), the davach of Stromcastell, Ardnagald, Ardneskan, and Blaad, and the half davach of Sannachan (Sanachan), Rassoll (Rassal), Meikle Strome, and Rerag (Reraig), in the Earldom of Ross, together of the old extent of £8 13s 4d." He was served heir male to his father Kenneth, Lord Mackenzie of Kintail, in the lands and barony of Pluscardine, on 14 January 1620; and had charters of Balmungie and Avoch, on 18 July 1635; of Raasay, on 18 February 1637 and of Lochalsh, on 4 July 1642.