820
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 820 DCCCXX |
| Ab urbe condita | 1573 |
| Armenian calendar | 269 ԹՎ ՄԿԹ |
| Assyrian calendar | 5570 |
| Bengali calendar | 227 |
| Berber calendar | 1770 |
| Buddhist calendar | 1364 |
| Burmese calendar | 182 |
| Byzantine calendar | 6328–6329 |
| Chinese calendar |
己亥年 (Earth Pig) 3516 or 3456 — to — 庚子年 (Metal Rat) 3517 or 3457 |
| Coptic calendar | 536–537 |
| Discordian calendar | 1986 |
| Ethiopian calendar | 812–813 |
| Hebrew calendar | 4580–4581 |
| Hindu calendars | |
| - Vikram Samvat | 876–877 |
| - Shaka Samvat | 741–742 |
| - Kali Yuga | 3920–3921 |
| Holocene calendar | 10820 |
| Iranian calendar | 198–199 |
| Islamic calendar | 204–205 |
| Japanese calendar |
Kōnin 11 (弘仁１１年) |
| Javanese calendar | 716–717 |
| Julian calendar | 820 DCCCXX |
| Korean calendar | 3153 |
| Minguo calendar | 1092 before ROC 民前1092年 |
| Nanakshahi calendar | −648 |
| Seleucid era | 1131/1132 AG |
| Thai solar calendar | 1362–1363 |
Year 820 (DCCCXX) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar.
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