Prince Nikolaos of Greece and Denmark (born 1 October 1969) is the third child of Constantine II and Anne-Marie of Denmark, who were the last King and Queen of the Hellenes, reigning from 1964 to 1973.

Nikolaos was born on 1 October 1969 in Rome, Italy, where his family had been living in self-exile since December 1967. His father was deposed in 1973 and the monarchy abolished 8 December 1974.

Like his brothers and sisters, he was educated in the Hellenic College of London, founded by his parents in 1980. He attended Brown University in Rhode Island graduating with an A.B. in International Relations. He has worked for Fox Television Network in New York, NatWest Markets in London and is currently working in his father’s private office since 1998. He is a member of board of the Anna-Maria Foundation, designed to help victims of natural disasters like floods and earthquakes in Greece.

Nikolaos has an older sister Alexia, an older brother Pavlos, a younger sister Theodora and a younger brother, Philippos.

Nikolaos’s engagement to Tatiana Ellinka Blatnik, with whom he had been in a long term relationship, was announced on 28 December 2009, by the office of King Constantine in London. Until July 2010, when she resigned to concentrate on her wedding plans, Blatnik had worked in the publicity department as an event planner for fashion designer Diane von Fürstenberg.

The couple married in the Orthodox Church of St. Nicholas, Spetses, Greece on 25 August 2010