|Centuries:||3rd century – 4th century – 5th century|
|Decades:||290s 300s 310s – 320s – 330s 340s 350s|
|Years:||324 325 326 – 327 – 328 329 330|
|327 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1080|
|Chinese calendar||丙戌年 (Fire Dog)
3023 or 2963
— to —
丁亥年 (Fire Pig)
3024 or 2964
|- Vikram Samvat||383–384|
|- Shaka Samvat||249–250|
|- Kali Yuga||3428–3429|
|Iranian calendar||295 BP – 294 BP|
|Islamic calendar||304 BH – 303 BH|
|Minguo calendar||1585 before ROC
|Seleucid era||638/639 AG|
|Thai solar calendar||869–870|
Year 327 (CCCXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Maximus (or, less frequently, year 1080 Ab urbe condita). The denomination 327 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.
- Emperor Constantine the Great decrees that rural slaves can only be sold in the province where they reside, in order to resolve the shortage of labour in the Roman Empire.
- Construction begins on the cathedral of Antioch (Syria).
- Approximate traditional date – Helena, mother of Constantine, returning from her pilgrimage to the Holy Land, founds Stavrovouni Monastery on Cyprus.