Princess Maria-Olympia of Greece and Denmark is a fashion model, socialite and member of the former Greek royal family. She is the oldest child and only daughter of Pavlos, Crown Prince of Greece, and his wife, Marie-Chantal Miller. Her paternal grandparents are Constantine II of Greece and Anne-Marie of Denmark, who were the last King and Queen of the Hellenes, while her maternal grandfather is duty free entrepreneur Robert Warren Miller.

The currently deposed Greek royal family was the ruling family of the Kingdom of Greece from 1863 to 1924 and again from 1935 to 1973. The family is a branch of the Danish royal family, itself a branch of the House of Glücksburg. Upon its accession to power, It replaced the House of Wittelsbach that previously ruled Greece from 1832 to 1862. The first monarch was George I of Greece, the second son of King Christian IX of Denmark. The current head of the family is Pavlos, who assumed the role upon the death of his father, former King Constantine II on 10 January 2023.