George Hume Steuart, (1700–1784) was a Scottish physician, tobacco planter, and Loyalist politician in colonial Maryland. Born in Perthshire, Steuart emigrated to Maryland in around 1721, where he benefited from proprietarial patronage and was appointed to a number of colonial offices, eventually becoming a wealthy landowner with estates in both Maryland and Scotland, and serving two terms as mayor of Annapolis. However, he was forced by the outbreak of the American Revolution to decide whether to remain loyal to the Crown or to throw in his lot with the American rebels. In 1775 Steuart sailed to Scotland, deciding at age 75 that "he could not turn rebel in his old age". He remained there until his death in 1784.

Stewart of Balquhidder is a Perthshire branch of the Stewart clan and scions of the royal House of Stewart from an illegitimate branch. They are descended from Sir William Stewart of Baldorran, who was the great grandson of Murdoch Stewart, Duke of Albany, executed by King James I of Scotland for treason in 1425. Murdoch Stewart was himself the grandson of King Robert II of Scotland, who founded the Stewart dynasty.