 Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach (1844–1894)

Karl August, Hereditary Grand Duke of Saxe-Weimar-Eisenach (31 July 1844 – 20 November 1894) was a German prince and Hereditary Grand Duke ("Erbgroßherzog") of Saxe-Weimar-Eisenach.Born in Weimar, Karl was the only son of Karl Alexander, Grand Duke of Saxe-Weimar-Eisenach and Princess Sophie of the Netherlands.