| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1811 by topic |
|---|
| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1811 MDCCCXI |
| Ab urbe condita | 2564 |
| Armenian calendar | 1260 ԹՎ ՌՄԿ |
| Assyrian calendar | 6561 |
| Balinese saka calendar | 1732–1733 |
| Bengali calendar | 1218 |
| Berber calendar | 2761 |
| British Regnal year | 51 Geo. 3 – 52 Geo. 3 |
| Buddhist calendar | 2355 |
| Burmese calendar | 1173 |
| Byzantine calendar | 7319–7320 |
| Chinese calendar | 庚午年 (Metal Horse) 4508 or 4301 — to — 辛未年 (Metal Goat) 4509 or 4302 |
| Coptic calendar | 1527–1528 |
| Discordian calendar | 2977 |
| Ethiopian calendar | 1803–1804 |
| Hebrew calendar | 5571–5572 |
| Hindu calendars | |
| - Vikram Samvat | 1867–1868 |
| - Shaka Samvat | 1732–1733 |
| - Kali Yuga | 4911–4912 |
| Holocene calendar | 11811 |
| Igbo calendar | 811–812 |
| Iranian calendar | 1189–1190 |
| Islamic calendar | 1225–1226 |
| Japanese calendar | Bunka 8 (文化８年) |
| Javanese calendar | 1737–1738 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4144 |
| Minguo calendar | 101 before ROC 民前101年 |
| Nanakshahi calendar | 343 |
| Thai solar calendar | 2353–2354 |
| Tibetan calendar | 阳金马年 (male Iron-Horse) 1937 or 1556 or 784 — to — 阴金羊年 (female Iron-Goat) 1938 or 1557 or 785 |
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1811 (MDCCCXI) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1811th year of the Common Era (CE) and Anno Domini (AD) designations, the 811th year of the 2nd millennium, the 11th year of the 19th century, and the 2nd year of the 1810s decade. As of the start of 1811, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.