| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 790s 800s 810s – 820s – 830s 840s 850s |
| Years: | 821 822 823 – 824 – 825 826 827 |
| 824 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 824 DCCCXXIV |
| Ab urbe condita | 1577 |
| Armenian calendar | 273 ԹՎ ՄՀԳ |
| Bahá'í calendar | -1020 – -1019 |
| Bengali calendar | 231 |
| Berber calendar | 1774 |
| Buddhist calendar | 1368 |
| Burmese calendar | 186 |
| Byzantine calendar | 6332 – 6333 |
| Chinese calendar | 癸卯年十一月廿七日 (3460/3520-11-27) — to —
甲辰年十二月初八日(3461/3521-12-8) |
| Coptic calendar | 540 – 541 |
| Ethiopian calendar | 816 – 817 |
| Hebrew calendar | 4584 – 4585 |
| Hindu calendars | |
| - Bikram Samwat | 880 – 881 |
| - Shaka Samvat | 746 – 747 |
| - Kali Yuga | 3925 – 3926 |
| Holocene calendar | 10824 |
| Iranian calendar | 202 – 203 |
| Islamic calendar | 208 – 209 |
| Japanese calendar | |
| Korean calendar | 3157 |
| Thai solar calendar | 1367 |