| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 831 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 831 DCCCXXXI |
| Ab urbe condita | 1584 |
| Armenian calendar | 280 ԹՎ ՄՁ |
| Assyrian calendar | 5581 |
| Balinese saka calendar | 752–753 |
| Bengali calendar | 238 |
| Berber calendar | 1781 |
| Buddhist calendar | 1375 |
| Burmese calendar | 193 |
| Byzantine calendar | 6339–6340 |
| Chinese calendar | 庚戌年 (Metal Dog) 3528 or 3321 — to — 辛亥年 (Metal Pig) 3529 or 3322 |
| Coptic calendar | 547–548 |
| Discordian calendar | 1997 |
| Ethiopian calendar | 823–824 |
| Hebrew calendar | 4591–4592 |
| Hindu calendars | |
| - Vikram Samvat | 887–888 |
| - Shaka Samvat | 752–753 |
| - Kali Yuga | 3931–3932 |
| Holocene calendar | 10831 |
| Iranian calendar | 209–210 |
| Islamic calendar | 215–216 |
| Japanese calendar | Tenchō 8 (天長８年) |
| Javanese calendar | 727–728 |
| Julian calendar | 831 DCCCXXXI |
| Korean calendar | 3164 |
| Minguo calendar | 1081 before ROC 民前1081年 |
| Nanakshahi calendar | −637 |
| Seleucid era | 1142/1143 AG |
| Thai solar calendar | 1373–1374 |
| Tibetan calendar | 阳金狗年 (male Iron-Dog) 957 or 576 or −196 — to — 阴金猪年 (female Iron-Pig) 958 or 577 or −195 |
Year 831 (DCCCXXXI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.