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|333 by topic|
|Ab urbe condita||1086|
|Balinese saka calendar||254–255|
|Chinese calendar||壬辰年 (Water Dragon)|
3029 or 2969
— to —
癸巳年 (Water Snake)
3030 or 2970
|- Vikram Samvat||389–390|
|- Shaka Samvat||254–255|
|- Kali Yuga||3433–3434|
|Iranian calendar||289 BP – 288 BP|
|Islamic calendar||298 BH – 297 BH|
|Minguo calendar||1579 before ROC|
|Seleucid era||644/645 AG|
|Thai solar calendar||875–876|
459 or 78 or −694
— to —
460 or 79 or −693
Year 333 (CCCXXXIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Dalmatius and Zenophilus (or, less frequently, year 1086 Ab urbe condita). The denomination 333 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.
- Flavius Dalmatius and Domitius Zenofilus are appointed consuls.
- Emperor Constantine the Great pulls Roman troops out of Britain and abandons work on Hadrian's Wall.
- Calocaerus revolts against Constantine I and proclaims himself emperor. Flavius Dalmatius, responsible for the security of the eastern frontier, is sent to Cyprus to suppress the rebellion.
- December 25 – Constantine I elevates his youngest son Constans to the rank of Caesar at Constantinople.
- Shi Hong succeeds his father Shi Le as Emperor of the Later Zhao Empire, in the Period of the Sixteen Kingdoms, but Shi Hong's third cousin Shi Hu held real power. Empress Dowager Liu (widow of Shi Le) failed to get rid of Shi Hu and Shi Hu had her deposed and killed.
- Empress Liu
- Murong Hui, Xianbei chief and Duke Xiang of Liaodong (b. 269)
- Shi Le, founder and emperor of the Chinese Jie state (b. 274)