William Stewart (c. 1706 – 3 May 1748) was a Scottish soldier and politician MP in the British Parliament.
He was educated at Glasgow University, and served as an officer in the British Army, becoming a captain in the 12th Dragoons in 1737.
He sat in the House of Commons of Great Britain from 1741 to 1747 as MP for Wigtown Burghs.
His older brother James Stewart was also an MP for Wigtown Burghs.
This article about a Member of the Parliament of Great Britain (1707–1800) representing a Scottish constituency is a stub.