| Millennium: | 1st millennium |
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| Centuries: |
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| Decades: |
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| Years: |
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| 620 by topic |
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| Leaders |
| Categories |
| Gregorian calendar | 620 DCXX |
| Ab urbe condita | 1373 |
| Armenian calendar | 69 ԹՎ ԿԹ |
| Assyrian calendar | 5370 |
| Balinese saka calendar | 541–542 |
| Bengali calendar | 27 |
| Berber calendar | 1570 |
| Buddhist calendar | 1164 |
| Burmese calendar | −18 |
| Byzantine calendar | 6128–6129 |
| Chinese calendar | 己卯年 (Earth Rabbit) 3317 or 3110 — to — 庚辰年 (Metal Dragon) 3318 or 3111 |
| Coptic calendar | 336–337 |
| Discordian calendar | 1786 |
| Ethiopian calendar | 612–613 |
| Hebrew calendar | 4380–4381 |
| Hindu calendars | |
| - Vikram Samvat | 676–677 |
| - Shaka Samvat | 541–542 |
| - Kali Yuga | 3720–3721 |
| Holocene calendar | 10620 |
| Iranian calendar | 2 BP – 1 BP |
| Islamic calendar | 2 BH – 1 BH |
| Japanese calendar | N/A |
| Javanese calendar | 510–511 |
| Julian calendar | 620 DCXX |
| Korean calendar | 2953 |
| Minguo calendar | 1292 before ROC 民前1292年 |
| Nanakshahi calendar | −848 |
| Seleucid era | 931/932 AG |
| Thai solar calendar | 1162–1163 |
| Tibetan calendar | 阴土兔年 (female Earth-Rabbit) 746 or 365 or −407 — to — 阳金龙年 (male Iron-Dragon) 747 or 366 or −406 |
Year 620 (CXX) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. The designation 620 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.
