1781

1781 (MDCCLXXXI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1781st year of the Common Era (CE) and Anno Domini (AD) designations, the 781st year of the 2nd millennium, the 81st year of the 18th century, and the 2nd year of the 1780s decade. As of the start of 1781, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium:	2nd millennium
Centuries:	17th century – 18th century – 19th century
Decades:	1750s  1760s  1770s  – 1780s –  1790s  1800s  1810s
Years:	1778 1779 1780 – 1781 – 1782 1783 1784

1781 in other calendars

Gregorian calendar	1781 MDCCLXXXI
Ab urbe condita	2534
Armenian calendar	1230 ԹՎ ՌՄԼ
Assyrian calendar	6531
Balinese saka calendar	1702–1703
Bengali calendar	1188
Berber calendar	2731
British Regnal year	21 Geo. 3 – 22 Geo. 3
Buddhist calendar	2325
Burmese calendar	1143
Byzantine calendar	7289–7290
Chinese calendar	庚子年 (Metal Rat) 4477 or 4417     — to — 辛丑年 (Metal Ox) 4478 or 4418
Coptic calendar	1497–1498
Discordian calendar	2947
Ethiopian calendar	1773–1774
Hebrew calendar	5541–5542
Hindu calendars
- Vikram Samvat	1837–1838
- Shaka Samvat	1702–1703
- Kali Yuga	4881–4882
Holocene calendar	11781
Igbo calendar	781–782
Iranian calendar	1159–1160
Islamic calendar	1195–1196
Japanese calendar	An'ei 10 / Tenmei 1 (天明元年)
Javanese calendar	1706–1707
Julian calendar	Gregorian minus 11 days
Korean calendar	4114
Minguo calendar	131 before ROC 民前131年
Nanakshahi calendar	313
Thai solar calendar	2323–2324
Tibetan calendar	阳金鼠年 (male Iron-Rat) 1907 or 1526 or 754     — to — 阴金牛年 (female Iron-Ox) 1908 or 1527 or 755

Events

• March 13 – Uranus.
• End of the American Revolutionary War

Births

• January 26 – Achim von Arnim, German writer (d. 1831)
• January 30 – Adelbert von Chamisso, German writer (d. 1838)
• February 17 – Rene Theophile Hyacinthe Laennec, French physician and inventor (d. 1826)
• March 4 – Rebecca Gratz, American educator and philanthropist (d. 1869)
• March 13 – Karl Friedrich Schinkel, German architect and painter (d. 1841)
• June 9– George Stephenson, English engineer (d. 1848)
• June 21 – Siméon-Denis Poisson, French mathematician and physicist (d. 1840)
• July 6 – Thomas Stamford Raffles, English founder of Singapore (d. 1826)
• July 6 – John D. Sloat, American naval officer (d. 1867)
• July 27 – Mauro Giuliani, Italian composer (d. 1828)
• September 3 – Eugène de Beauharnais, French nobleman, son of Napoleon's wife Josephine (d. 1824)
• September 6 – Anton Diabelli, Austrian music publisher, editor, and composer (d. 1858)
• October 1 – James Lawrence, U.S. Navy officer (d. 1813)
• November 6 – Lucy Aikin, English writer (d. 1864)
• November 20 – Karl Friedrich Eichhorn, German jurist (d. 1854)
• November 29 – Andrés Bello, Venezuelan poet, lawmaked, teacher, philosopher and sociologist (d. 1865)
• November 30 – Alexander Berry, Scottish adventurer and Australian pioneer (d. 1873)
• December 11 – Sir David Brewster, Scottish physicist (d. 1868)
• William Williams of Wern, minister (d. 1840)