Carl August may refer to:
- Carl August, Crown Prince of Sweden (1768 – 1810), Danish nobleman
- Carl August, Grand Duke of Saxe-Weimar-Eisenach (1757 – 1828)
- Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach (1912–1988)
This disambiguation page lists articles about people with the same name.
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