| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 811 DCCCXI |
| Ab urbe condita | 1564 |
| Armenian calendar | 260 ԹՎ ՄԿ |
| Assyrian calendar | 5561 |
| Bengali calendar | 218 |
| Berber calendar | 1761 |
| Buddhist calendar | 1355 |
| Burmese calendar | 173 |
| Byzantine calendar | 6319–6320 |
| Chinese calendar |
庚寅年 (Metal Tiger) 3507 or 3447 — to — 辛卯年 (Metal Rabbit) 3508 or 3448 |
| Coptic calendar | 527–528 |
| Discordian calendar | 1977 |
| Ethiopian calendar | 803–804 |
| Hebrew calendar | 4571–4572 |
| Hindu calendars | |
| - Vikram Samvat | 867–868 |
| - Shaka Samvat | 732–733 |
| - Kali Yuga | 3911–3912 |
| Holocene calendar | 10811 |
| Iranian calendar | 189–190 |
| Islamic calendar | 195–196 |
| Japanese calendar |
Kōnin 2 (弘仁2年) |
| Javanese calendar | 707–708 |
| Julian calendar | 811 DCCCXI |
| Korean calendar | 3144 |
| Minguo calendar | 1101 before ROC 民前1101年 |
| Nanakshahi calendar | −657 |
| Seleucid era | 1122/1123 AG |
| Thai solar calendar | 1353–1354 |
Year 811 (DCCCXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.