| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 790s 800s 810s – 820s – 830s 840s 850s |
| Years: | 824 825 826 – 827 – 828 829 830 |
| 827 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 827 DCCCXXVII |
| Ab urbe condita | 1580 |
| Armenian calendar | 276 ԹՎ ՄՀԶ |
| Bahá'í calendar | -1017 – -1016 |
| Bengali calendar | 234 |
| Berber calendar | 1777 |
| Buddhist calendar | 1371 |
| Burmese calendar | 189 |
| Byzantine calendar | 6335 – 6336 |
| Chinese calendar | 丙午年十一月三十日 (3463/3523-11-30) — to —
丁未年十二月初十日(3464/3524-12-10) |
| Coptic calendar | 543 – 544 |
| Ethiopian calendar | 819 – 820 |
| Hebrew calendar | 4587 – 4588 |
| Hindu calendars | |
| - Bikram Samwat | 883 – 884 |
| - Shaka Samvat | 749 – 750 |
| - Kali Yuga | 3928 – 3929 |
| Holocene calendar | 10827 |
| Iranian calendar | 205 – 206 |
| Islamic calendar | 211 – 212 |
| Japanese calendar | |
| Korean calendar | 3160 |
| Thai solar calendar | 1370 |