Frederick III Margrave of Brandenburg-Ansbach (1 May 1616 Ansbach – 6 September 1634 Nördlingen) was a German nobleman. He was the eldest son of Joachim Ernst Margrave of Brandenburg-Ansbach who he succeeded in 1625. He was killed at the Battle of Nördlingen in 1634 unmarried and without issue meaning he was succeeded by his younger brother Albert II.