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|364 by topic|
|Ab urbe condita||1117|
|Balinese saka calendar||285–286|
|Chinese calendar||癸亥年 (Water Pig)|
3060 or 3000
— to —
甲子年 (Wood Rat)
3061 or 3001
|- Vikram Samvat||420–421|
|- Shaka Samvat||285–286|
|- Kali Yuga||3464–3465|
|Iranian calendar||258 BP – 257 BP|
|Islamic calendar||266 BH – 265 BH|
|Minguo calendar||1548 before ROC|
|Seleucid era||675/676 AG|
|Thai solar calendar||906–907|
490 or 109 or −663
— to —
491 or 110 or −662
Year 364 (CCCLXIV) was a leap 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 Augustus and Varronianus (or, less frequently, year 1117 Ab urbe condita). The denomination 364 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.
- February 17 – Emperor Jovian dies after a reign of eight months. He is found dead in his tent at Tyana (Asia Minor) en route back to Constantinople, in suspicious circumstances.
- February 26 – Valentinian I is proclaimed Emperor by officers of the Roman army at Nicaea in Bithynia. He addresses the soldiers (who threaten to riot) in a speech. He founds the Valentinian Dynasty and rules the Western Roman Empire, from Caledonia (Scotland) to the Rhine frontier, ensuring it a few years of relative security. He settles in Paris and establishes a militia to defend the region.
- March 28 – Valens, brother of Valentinian I, is appointed co-emperor (Augustus) in the palace of Hebdomon (Turkey). He rules the Eastern Roman Empire, from the Danube to the Persian border, and begins the first anti-pagan persecutions.
- Britain is forced to endure fierce barbarian raids.
- The Council of Laodicea decides some disciplinary questions of the church and attempts to establish the Biblical canon, but fails.
- Theon of Alexandria, Greek mathematician, observes a solar eclipse (June 16) and a lunar eclipse (November 25). He gains some renown for his version of Euclid's Elements and his commentaries on Ptolemy's Almagest.
- Sima Daozi, regent of the Eastern Jin Dynasty (d. 403)
- Xu Xianzhi, high official of the Liu Song Dynasty (d. 426)
- Ge Hong, Chinese taoist and government official (b. 283)
- February 17 – Jovian, Roman emperor (b. 331)