William Stewart of Castle Stewart, was a Scottish MP in the British Parliament. He was a member of a junior branch of the family of the Earl of Galloway

Earl of Galloway

Earl of Galloway is a title in the Peerage of Scotland. It was created in 1623 for Alexander Stewart, 1st Lord Garlies, with remainder to his heirs male bearing the name and arms of Stewart. He had already been created Lord Garlies in the Peerage of Scotland in 1607, with remainder to the heirs...

, being the first son of John Stewart of Castle Stewart.

Stewart was educated at Glasgow University. He was an officer in the 60th Regiment of Foot during the Seven Years' War

Seven Years' War

The Seven Years' War was a global military war between 1756 and 1763, involving most of the great powers of the time and affecting Europe, North America, Central America, the West African coast, India, and the Philippines...

, leaving the army in 1769 as a Captain.

He represented Wigtown Burghs

Wigtown (UK Parliament constituency)

Wigtown Burghs, also known as Wigton Burghs,. was a constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1800 and of the House of Commons of the Parliament of the United Kingdom from 1801 to 1885. It was represented by one Member of Parliament .The first election in...

 7 May 1770-1774 and Kirkcudbright Stewartry

Kirkcudbright Stewartry (UK Parliament constituency)

Kirkcudbright Stewartry, later known as Kirkcudbright or Kirkcudbrightshire, was a constituency of the House of Commons of the Parliament of Great Britain from 1708 to 1801 and of the Parliament of the United Kingdom from 1801 to 1918. It was represented by one Member of Parliament .The first...

1774-1780.