Christian August may refer to:
Christian August of Saxe-Zeitz (1666–1725) Christian August of Holstein-Gottorp, Prince of Eutin (1673–1726) Christian August, Prince of Anhalt-Zerbst (1690–1747) Christian August, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (1696–1754) Charles August, Crown Prince of Sweden (1768–1810), also known as Christian August of Augustenburg