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 between 1707 and 1722.
[2] He initially supported the Union with England, and when Annandale shifted towards opposing it, Johnstone intermittently joined him.
[3] At the 1715 general election he was returned as MP for Dumfriesshire alone and appears to have supported the Administration, although his only recorded vote was for the Peerage Bill in 1719.
However Annandale died in 1721 and Johnstone was on poor terms with his successor the second Marquess who had him removed from the council at Locmaben.
[4] Johnstone's younger son, John, married Annandale's stepmother which exacerbated the ill-feeling between the families.