821
| 8. yüzyıl | 9. yüzyıl | 10. yüzyıl | |
| 818 | 819 | 820 | 821 | 822 | 823 | 824 |
| Miladi | 821 DCCCXXI |
| Ab urbe condita | 1574 |
| Bahá'í | -1023 – -1022 |
| Bengal | 228 |
| Berberi | 1771 |
| Birmanya | 183 |
| Bizans | 6329 – 6330 |
| Budist | 1365 |
| Ermeni | 270 ԹՎ ՄՀ |
| Etiyopya | 813 – 814 |
| Hicri | 205 – 206 |
| Hint | |
| - Kali Yuga | 3922 – 3923 |
| - Shaka Samvat | 743 – 744 |
| - Vikram Samvat | 877 – 878 |
| Holosen takvimi | 10821 |
| İbrani | 4581 – 4582 |
| İran | 199 – 200 |
| Kıpti | 537 – 538 |
| Kore | 3154 |
| Tayland güneş | 1364 |
Olaylar
- Tang Mu Zong Çin imparatoru oldu.
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