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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 331 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 331 CCCXXXI |
| Ab urbe condita | 1084 |
| Assyrian calendar | 5081 |
| Balinese saka calendar | 252–253 |
| Bengali calendar | −262 |
| Berber calendar | 1281 |
| Buddhist calendar | 875 |
| Burmese calendar | −307 |
| Byzantine calendar | 5839–5840 |
| Chinese calendar | 庚寅年 (Metal Tiger) 3028 or 2821 — to — 辛卯年 (Metal Rabbit) 3029 or 2822 |
| Coptic calendar | 47–48 |
| Discordian calendar | 1497 |
| Ethiopian calendar | 323–324 |
| Hebrew calendar | 4091–4092 |
| Hindu calendars | |
| - Vikram Samvat | 387–388 |
| - Shaka Samvat | 252–253 |
| - Kali Yuga | 3431–3432 |
| Holocene calendar | 10331 |
| Iranian calendar | 291 BP – 290 BP |
| Islamic calendar | 300 BH – 299 BH |
| Javanese calendar | 212–213 |
| Julian calendar | 331 CCCXXXI |
| Korean calendar | 2664 |
| Minguo calendar | 1581 before ROC 民前1581年 |
| Nanakshahi calendar | −1137 |
| Seleucid era | 642/643 AG |
| Thai solar calendar | 873–874 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 457 or 76 or −696 — to — 阴金兔年 (female Iron-Rabbit) 458 or 77 or −695 |
Year 331 (CCCXXXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus and Ablabius (or, less frequently, year 1084 Ab urbe condita). The denomination 331 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.