| Charles Augustus | |
| Succession: | Head of the House of Saxe-Weimar-Eisenach |
| Predecessor: | Wilhelm Ernst |
| Successor: | Michael |
| Reign: | 24 April 1923 – 14 October 1988 |
| Reign-Type: | Tenure |
| Spouse: | Baroness Elisabeth von Wangenheim-Winterstein |
| Issue: | 3, including Prince Michael |
| House: | Saxe-Weimar-Eisenach |
| Father: | Wilhelm Ernst, Grand Duke of Saxe-Weimar-Eisenach |
| Mother: | Feodora of Saxe-Meiningen |
| Birth Date: | 28 July 1912[1] |
| Birth Place: | Schloss Wilhelmsthal |
| Death Place: | Schienen am Bodensee |
Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach (Carl August Wilhelm Ernst Friedrich Georg Johann Albrecht; 28 July 1912 – 14 October 1988), was a German prince and head of the grand ducal house of Saxe-Weimar-Eisenach.
He was born in Schloss Wilhelmsthal as the eldest son and heir of Wilhelm Ernst, Grand Duke of Saxe-Weimar-Eisenach, and his second wife, Princess Feodora of Saxe-Meiningen. His father's reign came to an end on 9 November 1918, as a result of the German revolution.
When his father died on 24 April 1923, Charles Augustus succeeded him as head of the House of Saxe-Weimar-Eisenach.
Charles Augustus died at Schienen and was succeeded as head of the grand ducal house by his son, Michael.
Charles Augustus was married at the Wartburg Castle on 5 October 1944 to Baroness Elisabeth of Wangenheim-Winterstein (Tübingen, 16 January 1912 - Munich, 15 March 2010), daughter of Othmar Baron von Wangenheim-Winterstein and wife, Baroness Maud von Trützschler. They had three children:[2]
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