Nikolaos J. Hatzidakis (Νικόλαος Χατζιδάκις, also Nicholas Hadzidakis, 25 April 1872 – 25 January 1942) was a Greek mathematician.
He returned to Greece and was appointed professor of theoretical mechanics and astronomy at the Hellenic Military Academy, where he taught from 1900 to 1904.
He was an Invited Speaker of the International Congress of Mathematicians in 1912 at Cambridge UK,[3] in 1920 at Strasbourg,[4] in 1928 at Bologna,[5] and in 1932 in Zurich.
In 1897 during the Greco-Turkish War, he interrupted his studies in Paris to take part in the rebellion against Ottoman rule that had begun in his family's homeland of Crete.
During the Axis occupation of Greece in World War II, although he knew German and Italian, he did not cooperate with the occupying powers and died of starvation in the Great Famine, on 25 January 1942 in Athens.