Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach may refer to:
- Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach (1844–1894)
- Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach (1912–1988)
This disambiguation page lists articles associated with the title Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach.
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