|Centuries:||3rd century – 4th century – 5th century|
|Decades:||280s 290s 300s – 310s – 320s 330s 340s|
|Years:||314 315 316 – 317 – 318 319 320|
|317 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1070|
|Chinese calendar||丙子年 (Fire Rat)
3013 or 2953
— to —
丁丑年 (Fire Ox)
3014 or 2954
|- Vikram Samvat||373–374|
|- Shaka Samvat||238–239|
|- Kali Yuga||3417–3418|
|Iranian calendar||305 BP – 304 BP|
|Islamic calendar||314 BH – 313 BH|
|Minguo calendar||1595 before ROC
|Seleucid era||628/629 AG|
|Thai solar calendar||859–860|
Year 317 (CCCXVII) was a common year starting on Tuesday (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 Bassus (or, less frequently, year 1070 Ab urbe condita). The denomination 317 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.
- March 1 – Emperor Constantine the Great and co-emperor Licinius elevate their sons Crispus, Constantine II (being still a baby) and Licinius II to Caesars. After this arrangement Constantine rules the dioceses Pannonia and Macedonia, and establishes his residence at Sirmium, from where he prepares a campaign against the Goths and Sarmatians.
- Licinius recognises Constantine I as senior emperor and executes Valerius Valens.
- Sixteen Kingdoms: Jin Yuandi flees with remnants of the Jin court and noble families to the south. He succeeds Jin Mindi as first emperor of the Eastern Jin Dynasty, and decides to make Jiankang (modern Nanjing) his new capital.
- The earliest historically verified reference to tea is recorded, although the Chinese have been drinking the beverage for centuries.
- August 7 – Constantius II, Roman Emperor (d. 361)
- Fú Jiàn, emperor of the Di state Former Qin (d. 355)
- Saint Martin of Tours, bishop of Tours (d. 397)
- Themistius, statesman, rhetorician and philosopher