Back 1851 Abkhazian 1851 Afrikaans 1851 ALS 1851 እ.ኤ.አ. Amharic 1851 AN 1851 Arabic 1851 ARY 1851 ARZ 1851 AST 1851 AVK
| Millennium: | 2nd millennium |
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| 1851 by topic |
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| Humanities |
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| Lists of leaders |
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| Gregorian calendar | 1851 MDCCCLI |
| Ab urbe condita | 2604 |
| Armenian calendar | 1300 ԹՎ ՌՅ |
| Assyrian calendar | 6601 |
| Baháʼí calendar | 7–8 |
| Balinese saka calendar | 1772–1773 |
| Bengali calendar | 1258 |
| Berber calendar | 2801 |
| British Regnal year | 14 Vict. 1 – 15 Vict. 1 |
| Buddhist calendar | 2395 |
| Burmese calendar | 1213 |
| Byzantine calendar | 7359–7360 |
| Chinese calendar | 庚戌年 (Metal Dog) 4548 or 4341 — to — 辛亥年 (Metal Pig) 4549 or 4342 |
| Coptic calendar | 1567–1568 |
| Discordian calendar | 3017 |
| Ethiopian calendar | 1843–1844 |
| Hebrew calendar | 5611–5612 |
| Hindu calendars | |
| - Vikram Samvat | 1907–1908 |
| - Shaka Samvat | 1772–1773 |
| - Kali Yuga | 4951–4952 |
| Holocene calendar | 11851 |
| Igbo calendar | 851–852 |
| Iranian calendar | 1229–1230 |
| Islamic calendar | 1267–1268 |
| Japanese calendar | Kaei 4 (嘉永４年) |
| Javanese calendar | 1779–1780 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4184 |
| Minguo calendar | 61 before ROC 民前61年 |
| Nanakshahi calendar | 383 |
| Thai solar calendar | 2393–2394 |
| Tibetan calendar | 阳金狗年 (male Iron-Dog) 1977 or 1596 or 824 — to — 阴金猪年 (female Iron-Pig) 1978 or 1597 or 825 |
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1851 (MDCCCLI) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1851st year of the Common Era (CE) and Anno Domini (AD) designations, the 851st year of the 2nd millennium, the 51st year of the 19th century, and the 2nd year of the 1850s decade. As of the start of 1851, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.