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.

Clan Stewart is a Scottish Highland and Lowland clan. The clan is recognised by Court of the Lord Lyon; however, it does not have a Clan Chief recognised by the Lord Lyon King of Arms. Because the clan has no chief it can be considered an armigerous clan; however, the Earls of Galloway are now considered to be the principal branch of this clan, and the crest and motto of The Earls of Galloway's arms are used in the Clan Stewart crest badge. The Court of the Lord Lyon recognises two other Stewart/Stuart clans, Clan Stuart of Bute and Clan Stewart of Appin. Clan Stuart of Bute is the only one of the three clans at present which has a recognised chief.