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: