| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 790s 800s 810s – 820s – 830s 840s 850s |
| Years: | 819 820 821 – 822 – 823 824 825 |
| 822 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 822 DCCCXXII |
| Ab urbe condita | 1575 |
| Armenian calendar | 271 ԹՎ ՄՀԱ |
| Bahá'í calendar | -1022 – -1021 |
| Bengali calendar | 229 |
| Berber calendar | 1772 |
| Buddhist calendar | 1366 |
| Burmese calendar | 184 |
| Byzantine calendar | 6330 – 6331 |
| Chinese calendar | 辛丑年十二月初五日 (3458/3518-12-5) — to —
壬寅年十一月十五日(3459/3519-11-15) |
| Coptic calendar | 538 – 539 |
| Ethiopian calendar | 814 – 815 |
| Hebrew calendar | 4582 – 4583 |
| Hindu calendars | |
| - Bikram Samwat | 878 – 879 |
| - Shaka Samvat | 744 – 745 |
| - Kali Yuga | 3923 – 3924 |
| Holocene calendar | 10822 |
| Iranian calendar | 200 – 201 |
| Islamic calendar | 206 – 207 |
| Japanese calendar | |
| Korean calendar | 3155 |
| Thai solar calendar | 1365 |