Princess Thyra of Denmark, Danish pronunciation: [ˈtyːʁə], (29 September 1853 – 26 February 1933 in Gmunden) was the youngest daughter and fifth child of Christian IX of Denmark and Louise of Hesse-Kassel. In 1878, she married Ernest Augustus, the exiled heir to the Kingdom of Hanover. As the Kingdom of Hanover had been annexed by Prussia in 1866, she spent most of her life in exile with her husband in Austria.

Thyra was the younger sister of Frederik VIII of Denmark, Queen Alexandra of the United Kingdom, George I of Greece, Empress Maria Feodorovna of Russia and an elder sister of Prince Valdemar of Denmark.

Princess Thyra was born on 29 September 1853 at the Yellow Palace in Copenhagen as the third daughter and fifth child of Prince Christian and Princess Louise of Denmark. As a child, she shared a bedroom with her elder sisters, Alexandra and Dagmar, and was taught how to sew and knit her own clothes and socks. Her family had been relatively obscure but happy until her father, Prince Christian of Schleswig-Holstein-Sonderburg-Glücksburg, was chosen with the consent of the great powers to succeed his childless distant cousin, Frederick VII, to the Danish throne. Just two months before Thyra's birth, the new Act of Succession had been passed and Prince Christian given the title of Prince of Denmark.

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