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 (c.1440 – c.1500), 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.
The Stewarts of Balquhidder include the Stewarts of Ardvorlich, Glen Buckie, Gartnafuaran, and Annat. These families lived in the areas of Balquhidder, Callander, The Trossachs, Loch Earn and as far south as Stirling, from the 15th century to the present day. For the most part they were Tacksmen (Scottish Gaelic: Fear-Taic, meaning "supporting man"), land-holders of intermediate legal and social status in Scottish Highland society.
Although there is no formal clan association, the titular Clan Chief (were one to exist) would be Alexander Donald Stewart, 15th Laird of Ardvorlich, of Ardvorlich House, near Comrie, Perthshire. Stewart's family have lived at Ardvorlich House for over 400 years.