| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 780s 790s 800s – 810s – 820s 830s 840s |
| Years: | 808 809 810 – 811 – 812 813 814 |
| 811 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 811 DCCCXI |
| Ab urbe condita | 1564 |
| Armenian calendar | 260 ԹՎ ՄԿ |
| Assyrian calendar | 5561 |
| Bahá'í calendar | -1033–-1032 |
| Bengali calendar | 218 |
| Berber calendar | 1761 |
| English Regnal year | N/A |
| Buddhist calendar | 1355 |
| Burmese calendar | 173 |
| Byzantine calendar | 6319–6320 |
| Chinese calendar | 庚寅年十二月初三日 (3447/3507-12-3) — to —
辛卯年十二月十二日(3448/3508-12-12) |
| Coptic calendar | 527–528 |
| Ethiopian calendar | 803–804 |
| Hebrew calendar | 4571–4572 |
| Hindu calendars | |
| - Vikram Samvat | 867–868 |
| - Shaka Samvat | 733–734 |
| - Kali Yuga | 3912–3913 |
| Holocene calendar | 10811 |
| Iranian calendar | 189–190 |
| Islamic calendar | 195–196 |
| Japanese calendar | |
| Korean calendar | 3144 |
| Minguo calendar | 1101 before ROC 民前1101年 |
| Thai solar calendar | 1354 |
Year 811 (DCCCXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.