Princess Augusta of Schleswig-Holstein-Sonderburg-Glücksburg (27 June 1633 – 26 May 1701) was a Danish-German princess of the senior Glücksburg line of the Duke of Schleswig-Holstein.

She was the first Duchess of Augustenburg by marriage.

Augustenborg Palace, and as a consequence the nearby town, were named in honor of her.

The great-granddaughter of king Christian III of Denmark, she was the third daughter, eighth by birth, of Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg and Princess Sophia Hedwig of Saxe-Lauenburg (1601-1660).

[1] She was sister of Sophia Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg On 15 June 1651, at Copenhagen, she married her first cousin Ernest Günther (14 October 1609 – 18 January 1689), son of Duke Alexander of Schleswig-Holstein-Sonderburg and his wife Countess Dorothea of Schwarzburg-Sondershausen (1579-1639).