Franz Xaver Josef Baron of von Unertl (February 21, 1675 – January 22, 1750), was a Bavarian politician.
Von Unertl was born in Munich. He served as Electoral Bavarian Privy Council Chancellor and Conference Minister. His role under the Austrian occupation during the Spanish Succession War remains dubious. He died in his home town of Munich.
His sister Maria Johanna was married to the important salt merchant Johann Baptista Ruffini.