John Stuart, 1st Marquess of Bute PC, FRS (30 June 1744 – 16 November 1814), styled Lord Mount Stuart until 1792 and known as The Earl of Bute between 1792 and 1794, was a British nobleman, coalfield owner, diplomat and politician who sat in the House of Commons from 1766 to 1776.

[3] Lord Mount Stuart was returned as Tory Member of Parliament for Bossiney at a by-election in 1766.

[5] (He ranked higher in the order of precedence as the heir to an earldom than he did as a substantive baron.)

[6] In 1779, Lord Mount Stuart was sworn of the Privy Council and was sent as an envoy to the court of Turin.

In 1794 he was created Viscount Mountjoy, in the Isle of Wight, Earl of Windsor and Marquess of Bute.