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Year 360 (CCCLX) was a leap year starting on Saturday (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 Iulianus (or, less frequently, year 1113 Ab urbe condita). The denomination 360 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.
|Ab urbe condita||1113|
|Balinese saka calendar||281–282|
|Chinese calendar||己未年 (Earth Goat)|
3056 or 2996
— to —
庚申年 (Metal Monkey)
3057 or 2997
|- Vikram Samvat||416–417|
|- Shaka Samvat||281–282|
|- Kali Yuga||3460–3461|
|Iranian calendar||262 BP – 261 BP|
|Islamic calendar||270 BH – 269 BH|
|Minguo calendar||1552 before ROC|
|Seleucid era||671/672 AG|
|Thai solar calendar||902–903|
486 or 105 or −667
— to —
487 or 106 or −666
- February – Julian, Roman Caesar, is proclaimed emperor by the Gallic legions in Lutetia (modern Paris), at the Thermes de Cluny. They refuse to support the eastern campaign against King Shapur II of Persia, and revolt.
- The Alamanni raid Raetia (Switzerland), but are pushed back behind the Rhine by Julian, into the Black Forest.
- King Shapur II continues his campaign against the Roman fortresses, capturing Singara, Bezabde and Nisibis.
- Emperor Constantius II and Julian exchange several letters, both hoping to avoid a civil war.
- The Huns invade Europe by the thousands, spreading terror as they take over territories held for generations by Alans, Heruls, Ostrogoths and Visigoths.
- Roman authorities in Britain export wheat to supply the legions on the Rhine; they have encouraged production of wheat for that purpose.
- Council of Constantinople (360): Emperor Constantius II requests a church council, at Constantinople; both the eastern and western bishops attend the meeting. Ulfilas also attends the council and endorses the resulting creed. After the council several homoiousian bishops are deposed or banished, including Macedonius I of Constantinople and Cyril of Jerusalem.
- At about this date, Ligugé Abbey in France is founded for the monastic Order of Saint Benedict by Martin of Tours, under dispensation from Bishop Hilary of Poitiers.
- May 4 – Judas Cyriacus, Roman Catholic priest and saint
- October 14 – Gaudentius of Rimini, Roman Catholic priest and saint
- November 11 – Abramios the Recluse, Byzantine Orthodox priest and saint
- December 18 – Auxentius of Mopsuestia, Byzantine Orthodox priest and saint