621 BC
| Years |
|---|
| Millennium |
| 1st millennium BC |
| Centuries |
| Decades |
| Years |
| 621 BC by topic |
| Politics |
|---|
| Categories |
| Gregorian calendar | 621 BC DCXXI BC |
| Ab urbe condita | 133 |
| Ancient Egypt era | XXVI dynasty, 44 |
| - Pharaoh | Psamtik I, 44 |
| Ancient Greek Olympiad (summer) | 39th Olympiad, year 4 |
| Assyrian calendar | 4130 |
| Balinese saka calendar | N/A |
| Bengali calendar | −1214 – −1213 |
| Berber calendar | 330 |
| Buddhist calendar | −76 |
| Burmese calendar | −1258 |
| Byzantine calendar | 4888–4889 |
| Chinese calendar | 己亥年 (Earth Pig) 2077 or 1870 — to — 庚子年 (Metal Rat) 2078 or 1871 |
| Coptic calendar | −904 – −903 |
| Discordian calendar | 546 |
| Ethiopian calendar | −628 – −627 |
| Hebrew calendar | 3140–3141 |
| Hindu calendars | |
| - Vikram Samvat | −564 – −563 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2480–2481 |
| Holocene calendar | 9380 |
| Iranian calendar | 1242 BP – 1241 BP |
| Islamic calendar | 1280 BH – 1279 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 1713 |
| Minguo calendar | 2532 before ROC 民前2532年 |
| Nanakshahi calendar | −2088 |
| Thai solar calendar | −78 – −77 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) −494 or −875 or −1647 — to — 阳金鼠年 (male Iron-Rat) −493 or −874 or −1646 |
The year 621 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 133 Ab urbe condita . The denomination 621 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.