| William Frederick | |
| Margrave of Brandenburg-Ansbach | |
| House: | Hohenzollern |
| Father: | John Frederick, Margrave of Brandenburg-Ansbach |
| Mother: | Princess Eleonore Erdmuthe of Saxe-Eisenach |
| Spouse: | Christiane Charlotte of Württemberg-Winnental |
| Issue: | Karl Wilhelm Friedrich, Margrave of Brandenburg-Ansbach Margravine Eleonore Margrave Frederick Charles |
| Birth Place: | Ansbach |
| Death Place: | Unterreichenbach |
William Frederick, Margrave of Brandenburg-Ansbach (8 January 1686[1] – 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 father's second wife; Eleonore Erdmuthe of Saxe-Eisenach. His two surviving half-brothers, Margraves Christian Albert and George Frederick II, both died unmarried and without legitimate issue.
He married his first cousin, Christiane Charlotte of Württemberg-Winnental in 1709.[2] [3] He died in Unterreichenbach and was succeeded by his son Charles William Frederick, called "The Wild Margrave".[4]