621
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 621 DCXXI |
| Ab urbe condita | 1374 |
| Armenian calendar | 70 ԹՎ Հ |
| Assyrian calendar | 5371 |
| Bengali calendar | 28 |
| Berber calendar | 1571 |
| Buddhist calendar | 1165 |
| Burmese calendar | −17 |
| Byzantine calendar | 6129–6130 |
| Chinese calendar |
庚辰年 (Metal Dragon) 3317 or 3257 — to — 辛巳年 (Metal Snake) 3318 or 3258 |
| Coptic calendar | 337–338 |
| Discordian calendar | 1787 |
| Ethiopian calendar | 613–614 |
| Hebrew calendar | 4381–4382 |
| Hindu calendars | |
| - Vikram Samvat | 677–678 |
| - Shaka Samvat | 542–543 |
| - Kali Yuga | 3721–3722 |
| Holocene calendar | 10621 |
| Iranian calendar | 1 BP – 0 BP |
| Islamic calendar | 1 BH – 0 BH |
| Japanese calendar | N/A |
| Javanese calendar | 511–512 |
| Julian calendar | 621 DCXXI |
| Korean calendar | 2954 |
| Minguo calendar | 1291 before ROC 民前1291年 |
| Nanakshahi calendar | −847 |
| Seleucid era | 932/933 AG |
| Thai solar calendar | 1163–1164 |
Year 621 (DCXXI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 621 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.
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