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Charles Augustus
Hereditary Grand Duke of Saxe-Weimar-Eisenach
Head of the House of Saxe-Weimar-Eisenach
Tenure	24 April 1923 – 14 October 1988
Predecessor	Wilhelm Ernst
Successor	Michael
Born	(1912-07-28)28 July 1912[1] Schloss Wilhelmsthal[1]
Died	14 October 1988(1988-10-14) (aged 76) Schienen am Bodensee
Spouse	Baroness Elisabeth von Wangenheim-Winterstein
Issue	3, including Prince Michael
Names German: Carl August Wilhelm Ernst Friedrich Georg Johann Albrecht English: Charles Augustus William Ernest Frederick George John Albert
House	Saxe-Weimar-Eisenach
Father	Wilhelm Ernst, Grand Duke of Saxe-Weimar-Eisenach
Mother	Feodora of Saxe-Meiningen

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.^{[citation needed]}

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]

• Princess Elisabeth of Saxe-Weimar-Eisenach (b. 22 July 1945). She married Mindert Diderik de Kant on 10 July 1981 and they were divorced in 1983.
• Michael, Prince of Saxe-Weimar-Eisenach (b. 15 November 1946). He married Renate Henkel (daughter of Konrad Henkel) on 4 July 1970 and they were divorced in 1974. He remarried Dagmar Hennings (b. 24 June 1948) on 15 November 1980. They have one daughter:
  • Princess Leonie of Saxe-Weimar-Eisenach (b. 30 October 1986)
• Princess Beatrice-Maria of Saxe-Weimar-Eisenach (b. 11 March 1948). She married Martin Davidson on 9 December 1977. They have one daughter.