William August, Duke of Saxe-Eisenach

William August
Duke of Saxe-Eisenach
Reign	1668–1671
Predecessor	Adolf William
Successor	Johann Georg I
Born	(1668-11-30)30 November 1668 Eisenach
Died	23 February 1671(1671-02-23) (aged 2) Eisenach
House	House of Wettin
Father	Adolf Wilhelm, Duke of Saxe-Eisenach
Mother	Marie Elisabeth of Brunswick-Wolfenbüttel
Religion	Lutheran

Wilhelm August, Duke of Saxe-Eisenach (30 November 1668 – 23 February 1671) was the youngest and only surviving son of Adolf Wilhelm, Duke of Saxe-Eisenach and Marie Elisabeth of Brunswick-Wolfenbüttel.

All his older brothers died before his father, and Wilhelm August, the fifth and youngest child, was born nine days after the death of Adolf Wilhelm (21 November 1668) and succeeded him in the duchy of Saxe-Eisenach from the moment of his birth, under the guardianship of his uncle Johann Georg.

A sickly boy, he died at Eisenach when only two years old, and Eisenach was inherited by his uncle Johann Georg.