Princess Louise of Denmark (Louise Caroline Josephine Sophie Thyra Olga) (17 February 1875 – 4 April 1906) was a Danish princess, the third child and oldest daughter of Frederick VIII of Denmark and his wife, Princess Louise of Sweden and Norway.

Princess Louise was born at Amalienborg Palace in Copenhagen on 17 February 1875. Her father was Crown Prince Frederick of Denmark, later King Frederick VIII. Her mother was Louise of Sweden, daughter of Charles XV, King of Sweden and Norway.

She married Prince Frederick of Schaumburg-Lippe (1868–1945) at Amalienborg Palace in Copenhagen on 5 May 1896. They had three children.

The marriage was an unhappy one and Princess Louise spent much time visiting her family, staying for 2 to 3 months at a time. Her father also came and visited with her each year.

Princess Louise died at Ratiboritz Castle on 4 April 1906. She and her father-in-law Prince William of Schaumburg-Lippe died five hours apart at the family castle in Nachod, Bohemia. The official cause of death of Princess Louise was "cerebral inflammation" caused by meningitis, after weeks of being ill. It is rumoured she attempted to drown herself in the castle lake on her husband's estate, Ratiboritz, and caught a chill in the attempt, eventually leading to her death. She was the first of the king's children to die.

Frederick and Louise had three children:

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