William Frederick Margrave of Brandenburg-Ansbach (8 January 1686 – 7 January 1723) was Margrave of the Principality of Brandenburg-Ansbach from 1703 until his death in 1723. He was the younger brother of Caroline of Ansbach and thus brother-in-law of George II of Great Britain.William Frederick was born in Ansbach in 1686 to John Frederick Margrave of Brandenburg-Ansbach and his second wife Eleonore Erdmuthe of Saxe-Eisenach.
