Princess Eugenie of Greece and Denmark (Greek: Ευγενία, romanized: Evyenía; 10 February 1910 – 13 February 1989) was by birth member of the Greek royal family and by marriage member of the House of Radziwiłł and House of Thurn und Taxis.

Eugenie was the youngest child and only daughter of Prince George of Greece and Denmark and his wife, Princess Marie Bonaparte, daughter of Marie-Félix Blanc and Prince Roland Bonaparte, a great-nephew of Napoleon I.

As a cousin of the bridegroom, Eugenie was a leading guest at the 1947 wedding of Princess Elizabeth and Philip, Duke of Edinburgh.

She authored Le Tsarevitch, Enfant Martyr, a biography of Aleksey Nikolaevich, Tsarevich of Russia, written in French, which was published in 1990.

They had two children:[2] Eugénie remarried on 28 November 1949 to Prince Raymundo della Torre e Tasso, Duke of Castel Duino, a cadet member of the House of Thurn and Taxis.