John Stewart, 3rd Earl of Buchan

John Stewart, 3rd Earl of Buchan, son and heir of Alexander, succeeded to the Earldom in 1505. He was retoured heir to his father in the Earldom and Earlshill in 1519; until then he retained the style of Master of Buchan which he had held in his father's lifetime. On his own resignation, a charter of all his lands, baronies, lordships, and heritable offices, and of the Earlshill, was granted 4 August 1547 to his son John Stewart and his heirs, reserving the Earl's liferent.

He married Margaret, daughter of James Scrymgeour of Dudhope, Constable of Dundee, by whom he had:

John Stewart is spoken of as recently dead in 1551. However his first son and heir had predeceased him, so title of the Earldom devolved to his granddaughter Christina.