1781
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1781 by topic: | |
| Arts and Sciences | |
| Archaeology – Architecture – Art – Literature (Poetry) – Music – Science | |
| Countries | |
| Austria – Canada – Denmark – France – Great Britain – Ireland – Norway – Russia – Scotland – Sweden – United States | |
| Lists of leaders | |
| State leaders – Colonial governors – Religious leaders | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Works category | |
| Works | |
| Gregorian calendar | 1781 MDCCLXXXI |
| Ab urbe condita | 2534 |
| Armenian calendar | 1230 ԹՎ ՌՄԼ |
| Assyrian calendar | 6531 |
| 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 |
1781 (MDCCLXXXI) was a common year starting on Monday (dominical letter G) of the Gregorian calendar and a common year starting on Friday (dominical letter C) 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.
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