| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 631 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 631 DCXXXI |
| Ab urbe condita | 1384 |
| Armenian calendar | 80 ԹՎ Ձ |
| Assyrian calendar | 5381 |
| Balinese saka calendar | 552–553 |
| Bengali calendar | 38 |
| Berber calendar | 1581 |
| Buddhist calendar | 1175 |
| Burmese calendar | −7 |
| Byzantine calendar | 6139–6140 |
| Chinese calendar | 庚寅年 (Metal Tiger) 3328 or 3121 — to — 辛卯年 (Metal Rabbit) 3329 or 3122 |
| Coptic calendar | 347–348 |
| Discordian calendar | 1797 |
| Ethiopian calendar | 623–624 |
| Hebrew calendar | 4391–4392 |
| Hindu calendars | |
| - Vikram Samvat | 687–688 |
| - Shaka Samvat | 552–553 |
| - Kali Yuga | 3731–3732 |
| Holocene calendar | 10631 |
| Iranian calendar | 9–10 |
| Islamic calendar | 9–10 |
| Japanese calendar | N/A |
| Javanese calendar | 521–522 |
| Julian calendar | 631 DCXXXI |
| Korean calendar | 2964 |
| Minguo calendar | 1281 before ROC 民前1281年 |
| Nanakshahi calendar | −837 |
| Seleucid era | 942/943 AG |
| Thai solar calendar | 1173–1174 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 757 or 376 or −396 — to — 阴金兔年 (female Iron-Rabbit) 758 or 377 or −395 |
Year 631 (DCXXXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 631 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.