Sir John Johnstone, 1st Baronet (died 30 September 1711) was a Scottish Army officer and politician.
He was the oldest son of Sir James Johnstone of Westerhall, Dumfriesshire, a member of the pre-Union Parliament of Scotland.
He supported the Court party in the hope of advancing his army career, and as circumstances changed he moved between patrons, including the rivals Annandale and Queensberry.
He died in September that year after being seriously wounded at the Siege of Tournai, and since his two marriages had produced a daughter, Philadelphia, but no sons, his baronetcy and estates passed to his brother William.
[2] This article about a Member of the Parliament of Great Britain (1707–1800) representing a Scottish constituency is a stub.