| Millennium: | 1st millennium |
|---|---|
| Centuries: | 6th century – 7th century – 8th century |
| Decades: | 590s 600s 610s – 620s – 630s 640s 650s |
| Years: | 620 621 622 – 623 – 624 625 626 |
| 623 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 623 DCXXIII |
| Ab urbe condita | 1376 |
| Armenian calendar | 72 ԹՎ ՀԲ |
| Bahá'í calendar | -1221 – -1220 |
| Bengali calendar | 30 |
| Berber calendar | 1573 |
| Buddhist calendar | 1167 |
| Burmese calendar | -15 |
| Byzantine calendar | 6131 – 6132 |
| Chinese calendar | 壬午年十一月廿五日 (3259/3319-11-25) — to —
癸未年十二月初五日(3260/3320-12-5) |
| Coptic calendar | 339 – 340 |
| Ethiopian calendar | 615 – 616 |
| Hebrew calendar | 4383 – 4384 |
| Hindu calendars | |
| - Bikram Samwat | 679 – 680 |
| - Shaka Samvat | 545 – 546 |
| - Kali Yuga | 3724 – 3725 |
| Holocene calendar | 10623 |
| Iranian calendar | 1 – 2 |
| Islamic calendar | 1 – 2 |
| Japanese calendar | |
| Korean calendar | 2956 |
| Thai solar calendar | 1166 |