Christian August I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg

Christian August I, Duke of Schleswig-Holstein-Sonderburg-Augustenburg (4 August 1696 – 20 January 1754) was a son of Frederick William of Schleswig-Holstein-Sonderburg-Augustenburg, who was himself a son of Ernest Günther.

He served as provost of the cathedral chapter in Hamburg. Later, he became governor of the Danish island Als, then General of the Infantry and Colonel of the royal guards in Denmark. In 1731, Christian August I succeeded his childless uncle Ernest August.

Marriage and issue
He married Frederikke Louise (1699–1744), the daughter of Count Christian Gyldenløve of Danneskiold-Samsøe. They had the following children:
 * Frederick Christian I
 * Emil August (1722–1786): Lieutenant General in the Danish army
 * Christian Ulrich (1723)
 * Sophie Charlotte (1725-1752)
 * Christine Ulrike (1727–1794)
 * Sofie Magdalene (1731–1799)
 * unnamed (1732)
 * Charlotte Amalie (1736–1815)
 * unnamed (1736)