Sir William Johnstone, 2nd Baronet of Sciennes and Westerhall was a Scottish landowner and politician who sat in the Parliament of Scotland from 1698 to 1707 and in the British House of Commons at various times between 1708 and 1722.
- Occupation
- politician
- Position held
- member of the 2nd Parliament of Great Britain, member of the 3rd Parliament of Great Britain, member of the 4th Parliament of Great Britain, member of the 5th Parliament of Great Britain
- Died
- October 8, 1727
