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Sir William Galbraith, 4th of that Ilk, Lord of Buthernock and Kincaid, was a Scottish noble. He was the eldest son of Arthur Galbraith.

William took part in the rescue of the boy king Alexander III from his father-in-law John Comyn I of Badenoch‘s control.^[1] William become one of the co-Regents of Scotland in 1255.^[1][2]

He is known to have married a daughter of John Comyn I of Badenoch, they are known to have had the following issue:

• William Galbraith, married Willelma Douglas, had issue.

• Burke, Bernard (1963). Burke's Genealogical and Heraldic History of the Peerage, Baronetage and Knightage; Part 2. Burke's Peerage. OCLC 931322230.
• Moncreiffe of that Ilk, Iain (1967). The Highland Clans. London: Barrie & Rocklif.