Year 330 (CCCXXX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gallicanus and Tullianus (or, less frequently, year 1083 Ab urbe condita). The denomination 330 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

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• Basil the Great, bishop of Caesarea Mazaca (d. 379)
• Macrina the Younger, Christian nun and saint (d. 379)
• Moses the Black, Christian monk and priest (d. 405)
• Victricius of Rouen, Christian missionary and bishop
• Yang Xi, Chinese scholar and calligrapher (d. 386)

• Achillius of Larissa (or Achilles), Greek bishop
• Arnobius, Numidian apologist and writer
• Guo Mo, Chinese general and warlord
• Helena (Augusta), mother of Constantine I
• Tiridates III ("the Great"), king of Armenia
• Vicinius of Sarsina, Italian Christian bishop
• Zu Yue, Chinese general and warlord