Christian August, Prince of Waldeck and Pyrmont (German: Christian August Prinz zu Waldeck; Portuguese: Cristiano Augusto; 6 December 1744, Arolsen – 24 September 1798,[1] Palácio Nacional de Sintra, Sintra, near Lisbon) was a general in the Austrian service, and last commander and Field Marshal of the Portuguese land army.

Therefore, his Grand Tour took him to Italy where he was one of the temporary companions of Johann Wolfgang von Goethe on his Italian Journey.

Christian August later contributed significantly to the large collection of antiques in the Waldecker Arolsen Castle.

[2] Like his father, the last commander of the Dutch army in the War of the Austrian Succession, Christian August also entered into the military service.

In 1781, he published his Kleine Berichtigungen über Versuch einer Geschichte des bayerischen Erbfolgekrieges ("Small corrections to an attempt to describe the history of the Bavarian War of Succession").

He was summoned to Vienna and was commissioned by Emperor Francis II to write a plan of operations for the joint Austro-Prussian army in the Rhineland, which was however not accepted by Prussia.

He was awarded the Commander's Cross of the Military Order of Maria Theresa for his achievements at Wissembourg and promoted to general of cavalry.