Hatzidakis or Hadjidakis () is a Greek surname, a diminutive of Hatzis:
Georgios Hatzidakis (1843–1941), Greek linguist Hatzidakis (athlete), shooter in the 1896 Olympics Ioannis Hatzidakis (1844–1921), Greek mathematician Kostis Hatzidakis (born 1965), Greek conservative politician Manos Hatzidakis (1925–1994), Greek composer Nikolaos Hatzidakis (1872–1942), Greek mathematician