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Year 354 (CCCLIV) was a common 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 Constantius (or, less frequently, year 1107 Ab urbe condita). The denomination 354 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||1107|
|Balinese saka calendar||275–276|
|Chinese calendar||癸丑年 (Water Ox)|
3050 or 2990
— to —
甲寅年 (Wood Tiger)
3051 or 2991
|- Vikram Samvat||410–411|
|- Shaka Samvat||275–276|
|- Kali Yuga||3454–3455|
|Iranian calendar||268 BP – 267 BP|
|Islamic calendar||276 BH – 275 BH|
|Minguo calendar||1558 before ROC|
|Seleucid era||665/666 AG|
|Thai solar calendar||896–897|
480 or 99 or −673
— to —
481 or 100 or −672
- Emperor Constantius II recalls his Caesar (and cousin) Constantius Gallus to Constantinople after hearing unfavorable reports about him. Gallus, Caesar of the East, has suppressed revolts in Palestine and central Anatolia. Constantius strips him of his powers and later has him executed in Pola (Croatia).
- The Roman Calendar of 354, an illuminated manuscript, is drawn up and becomes the earliest dated codex.
- As a result of the armies of the West having been largely withdrawn by the usurper Magnus Magnentius, to fight Constantius II, hordes of barbarians (Franks and Alemanni) cross the upper Rhine into Gaul and invade the lands of the Helvetians.
- The Bulgars are first mentioned in extant European chronicles.
- Libanius becomes a teacher of rhetoric in Antioch; his students include John Chrysostom and Theodore of Mopsuestia.