Alexander Stewart, 6th Earl of Galloway (c. 1694–24 September 1773) was the son of James Stewart, 5th Earl of Galloway by Catherine, daughter of Alexander Montgomerie, 9th Earl of Eglinton (c.1660-1729).
In 1719, he married Lady Anne Keith, the youngest daughter of the 8th Earl Marischal and they had one child:
Lady Anne died in 1728 and Alexander married Lady Catherine Cochrane, the youngest daughter of the John Cochrane, 4th Earl of Dundonald {see Earl of Dundonald}, in 1729. They had seven children:
| Masonic offices | ||
|---|---|---|
| Preceded by Lord Aberdour |
Grand Master of the Grand Lodge of Scotland 1757–1759 |
Succeeded by The Earl of Leven |
| Peerage of Scotland | ||
| Preceded by James Stewart |
Earl of Galloway | Succeeded by John Stewart |
