House of Schleswig-Holstein-Sonderburg-Augustenburg

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House of Schleswig-Holstein-Sonderburg-Augustenburg
Parent house	House of Oldenburg
Country	Denmark
Founded	1647
Founder	Ernest Günther
Titles	Duke of Schleswig-Holstein-Sonderburg-Augustenburg Duke of Schleswig-Holstein Crown Prince of Sweden
Dissolution	27 April 1931

The House of Schleswig-Holstein-Sonderburg-Augustenburg (Danish: Slesvig-Holsten-Sønderborg-Augustenborg) was a branch of the dukes of Schleswig-Holstein-Sonderburg of the House of Oldenburg. The line descended from Alexander, Duke of Schleswig-Holstein-Sonderburg. Like all of the secondary lines from the Sonderburg branch, the heads of the House of Schleswig-Holstein-Sonderburg-Augustenburg were first known as Dukes of Schleswig-Holstein and Dukes of Sonderburg. The family took its name from its ancestral home, Augustenborg Palace in Augustenborg, Denmark.