The year 631 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 123 Ab urbe condita . The denomination 631 BC 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.
| Millennium: | 1st millennium BC |
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| Gregorian calendar | 631 BC DCXXXI BC |
| Ab urbe condita | 123 |
| Ancient Egypt era | XXVI dynasty, 34 |
| - Pharaoh | Psamtik I, 34 |
| Ancient Greek era | 37th Olympiad, year 2 |
| Assyrian calendar | 4120 |
| Balinese saka calendar | N/A |
| Bengali calendar | −1223 |
| Berber calendar | 320 |
| Buddhist calendar | −86 |
| Burmese calendar | −1268 |
| Byzantine calendar | 4878–4879 |
| Chinese calendar | 己丑年 (Earth Ox) 2067 or 1860 — to — 庚寅年 (Metal Tiger) 2068 or 1861 |
| Coptic calendar | −914 – −913 |
| Discordian calendar | 536 |
| Ethiopian calendar | −638 – −637 |
| Hebrew calendar | 3130–3131 |
| Hindu calendars | |
| - Vikram Samvat | −574 – −573 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2470–2471 |
| Holocene calendar | 9370 |
| Iranian calendar | 1252 BP – 1251 BP |
| Islamic calendar | 1290 BH – 1289 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 1703 |
| Minguo calendar | 2542 before ROC 民前2542年 |
| Nanakshahi calendar | −2098 |
| Thai solar calendar | −88 – −87 |
| Tibetan calendar | 阴土牛年 (female Earth-Ox) −504 or −885 or −1657 — to — 阳金虎年 (male Iron-Tiger) −503 or −884 or −1656 |
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