Prince Frederick Charles Augustus of Württemberg (German: Friedrich Karl August Prinz von Württemberg) (21 February 1808 – 9 May 1870) was a General in the Army of Württemberg and the father of William II of Württemberg. Frederick was a member of the Royal Family of Württemberg and a Prince of Württemberg.

Frederick was born 21 February 1808 at Schloss Comburg (now part of Schwäbisch Hall), Kingdom of Württemberg, the second child and eldest son of Prince Paul of Württemberg and his wife Princess Charlotte of Saxe-Hildburghausen. Through his father, Frederick was a grandson of Frederick I of Württemberg and through his mother, a grandson of Frederick, Duke of Saxe-Altenburg. He was a younger brother of Grand Duchess Elena Pavlovna of Russia and an elder brother of Pauline, Duchess of Nassau and Prince August of Württemberg.

Frederick began his military career in the Army of Württemberg (German: Württembergische Armee) where by the age of 15, he had reached the rank of Rittmeister 2nd class. In 1832, he was a Colonel of the Infantry and by 1841, Frederick had attained the rank of Lieutenant General of the Cavalry. In 1865, Frederick was promoted by Charles I of Württemberg to General Commander of the Cavalry and the Württemberg Federal Army Corps (German: Württembergischen Bundesarmeekorps). In the Austro-Prussian War against Prussia, Frederick held no field command, but instead served as a liaison officer at the headquarters of the Austrian Feldzeugmeister. Despite his serious eye problems, Frederick was offended when he was not offered the command of the Eighth Army Corps during the war.

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