| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 600s 610s 620s 630s 640s 650s 660s |
| Years: | 628 629 630 631 632 633 634 |
| 631 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 631 DCXXXI |
| Ab urbe condita | 1384 |
| Armenian calendar | 80 ԹՎ Ձ |
| Bahá'í calendar | -1213 – -1212 |
| Bengali calendar | 38 |
| Berber calendar | 1581 |
| Buddhist calendar | 1175 |
| Burmese calendar | -7 |
| Byzantine calendar | 6139 – 6140 |
| Chinese calendar | 庚寅年十一月廿三日 (3267/3327-11-23) — to —
辛卯年十二月初三日(3268/3328-12-3) |
| Coptic calendar | 347 – 348 |
| Ethiopian calendar | 623 – 624 |
| Hebrew calendar | 4391 – 4392 |
| Hindu calendars | |
| - Bikram Samwat | 687 – 688 |
| - Shaka Samvat | 553 – 554 |
| - Kali Yuga | 3732 – 3733 |
| Holocene calendar | 10631 |
| Iranian calendar | 9 – 10 |
| Islamic calendar | 9 – 10 |
| Japanese calendar | |
| Korean calendar | 2964 |
| Thai solar calendar | 1174 |