|Centuries:||3rd century – 4th century – 5th century|
|Decades:||330s 340s 350s – 360s – 370s 380s 390s|
|Years:||361 362 363 – 364 – 365 366 367|
|364 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1117|
|Bahá'í calendar||-1480 – -1479|
|English Regnal year||N/A|
|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||286–287|
|- Kali Yuga||3465–3466|
|Igbo calendar||-636 – -635|
|Iranian calendar||258 BP – 257 BP|
|Islamic calendar||266 BH – 265 BH|
|Minguo calendar||1548 before ROC
|Thai solar calendar||907|
|Wikimedia Commons has media related to 364.|
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 the Roman army. He addresses the soldiers in a speech who threatened to riot.
- March 28 – Valens, brother of Valentinian I, is appointed co-emperor (Augustus) in the palace of Hebdomon (Turkey). He begins the first anti-pagan persecutions.
- Valentinian I rules from Caledonia (Scotland) to the Rhine frontier the Western Roman Empire and Valens reigns from the Danube to the Persian border the Eastern Roman Empire.
- Valentinian I founded the Valentinian Dynasty and settles in Paris. He establishes a militia to defend the region. His reign ensures the Roman Empire a few years of relative security.
- Britain is forced to endure fierce Barbarian raids.
- The Council of Laodicea decides some disciplinary questions of the Christian 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)