Year 330 (CCCXXX) was a common year starting on Thursday of the Julian calendar.
|Centuries:||3rd century – 4th century – 5th century|
|Decades:||300s 310s 320s – 330s – 340s 350s 360s|
|Years:||327 328 329 – 330 – 331 332 333|
|Ab urbe condita||1083|
|Balinese saka calendar||251–252|
|Chinese calendar||己丑年 (Earth Ox)|
3026 or 2966
— to —
庚寅年 (Metal Tiger)
3027 or 2967
|- Vikram Samvat||386–387|
|- Shaka Samvat||251–252|
|- Kali Yuga||3430–3431|
|Iranian calendar||292 BP – 291 BP|
|Islamic calendar||301 BH – 300 BH|
|Minguo calendar||1582 before ROC|
|Seleucid era||641/642 AG|
|Thai solar calendar||872–873|
456 or 75 or −697
— to —
457 or 76 or −696
- May 11 – Emperor Constantine the Great dedicates Constantinople, or Nova Roma (modern Istanbul), and moves the capital of the Roman Empire there from Rome. He spent 4 years building the city on the site of ancient Byzantium. He chose the site for its location (a seaport with easy access to Anatolia and the Danube).
- The Goths devastate the city of Tanais in the Don River delta.
- Ezana, king of Axum, extends his area of control to the west. He defeats the Nobates, and destroys the kingdom of Meroë.
- Frumentius is the first bishop of Ethiopia (approximate date).
- Eustathius, Patriarch of Antioch, is banished to Trajanopolis.
- The Bible is translated into the Gothic language by Wulfila.
- Pagan temples are starting to be abandoned, destroyed or left to fall into disrepair, except those that are turned into Christian churches.
- 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, missionary and bishop of Rouen (approximate date)
- for more information, see Category:330 deaths.