Hatzidakis or Hadjidakis (Greek: Χατζηδάκης or Χατζιδάκις) 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