Louise Augusta of Denmark and Norway (7 July 1771 – 13 January 1843) was the daughter of the Queen of Denmark-Norway, Caroline Matilda of Great Britain.

In February 1779 the nation's foremost statesman, Chief Minister Andreas Peter Bernstorff, hatched an ingenious plan for the young princess.

Since a son of hers could one day ascend the throne, it would be advantageous to arrange a marriage early, and to marry the "half-royal" back into the family, to the Hereditary Prince of Augustenborg.

The couple lived at the Danish court in Copenhagen for many years until the Christiansborg Palace fire of 1794 and the death of the elder Duke of Augustenborg (Frederik Christian I, 1721–1794), when her husband inherited the estate and the Duchy.

[1] Over the years conflict developed between her husband and her brother, especially over the relationship of the double-duchies of Schleswig-Holstein and his small appanage around Sonderborg on one hand and the Danish monarchy on the other.

In 1832 in order to give her youngest son, Frederik Emil August, better income possibilities she purchased the estate Nør and Grønwald in Dänischwold near Ekernførde Fjord in South Schleswig.

She is a minor character in The Lost Queen by Norah Lofts, a historical novel about the life of her mother, Caroline Matilda of Great Britain.