 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (November 2015) |
| Millennium: | 2nd millennium |
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| Years: |
| 1812 by topic |
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| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1812 MDCCCXII |
| Ab urbe condita | 2565 |
| Armenian calendar | 1261 ԹՎ ՌՄԿԱ |
| Assyrian calendar | 6562 |
| Balinese saka calendar | 1733–1734 |
| Bengali calendar | 1219 |
| Berber calendar | 2762 |
| British Regnal year | 52 Geo. 3 – 53 Geo. 3 |
| Buddhist calendar | 2356 |
| Burmese calendar | 1174 |
| Byzantine calendar | 7320–7321 |
| Chinese calendar | 辛未年 (Metal Goat) 4509 or 4302 — to — 壬申年 (Water Monkey) 4510 or 4303 |
| Coptic calendar | 1528–1529 |
| Discordian calendar | 2978 |
| Ethiopian calendar | 1804–1805 |
| Hebrew calendar | 5572–5573 |
| Hindu calendars | |
| - Vikram Samvat | 1868–1869 |
| - Shaka Samvat | 1733–1734 |
| - Kali Yuga | 4912–4913 |
| Holocene calendar | 11812 |
| Igbo calendar | 812–813 |
| Iranian calendar | 1190–1191 |
| Islamic calendar | 1226–1227 |
| Japanese calendar | Bunka 9 (文化９年) |
| Javanese calendar | 1738–1739 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4145 |
| Minguo calendar | 100 before ROC 民前100年 |
| Nanakshahi calendar | 344 |
| Thai solar calendar | 2354–2355 |
| Tibetan calendar | 阴金羊年 (female Iron-Goat) 1938 or 1557 or 785 — to — 阳水猴年 (male Water-Monkey) 1939 or 1558 or 786 |
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1812 (MDCCCXII) was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1812th year of the Common Era (CE) and Anno Domini (AD) designations, the 812th year of the 2nd millennium, the 12th year of the 19th century, and the 3rd year of the 1810s decade. As of the start of 1812, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.