1721 (MDCCXXI) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1721st year of the Common Era (CE) and Anno Domini (AD) designations, the 721st year of the 2nd millennium, the 21st year of the 18th century, and the 2nd year of the 1720s decade. As of the start of 1721, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium: 2nd millennium
Centuries: 17th century18th century19th century
Decades: 1690s  1700s  1710s  – 1720s –  1730s  1740s  1750s
Years: 1718 1719 172017211722 1723 1724
1721 in other calendars
Gregorian calendar1721
Ab urbe condita2474
Armenian calendar1170
Assyrian calendar6471
Balinese saka calendar1642–1643
Bengali calendar1128
Berber calendar2671
British Regnal yearGeo. 1 – 8 Geo. 1
Buddhist calendar2265
Burmese calendar1083
Byzantine calendar7229–7230
Chinese calendar庚子(Metal Rat)
4417 or 4357
    — to —
辛丑年 (Metal Ox)
4418 or 4358
Coptic calendar1437–1438
Discordian calendar2887
Ethiopian calendar1713–1714
Hebrew calendar5481–5482
Hindu calendars
 - Vikram Samvat1777–1778
 - Shaka Samvat1642–1643
 - Kali Yuga4821–4822
Holocene calendar11721
Igbo calendar721–722
Iranian calendar1099–1100
Islamic calendar1133–1134
Japanese calendarKyōhō 6
Javanese calendar1645–1646
Julian calendarGregorian minus 11 days
Korean calendar4054
Minguo calendar191 before ROC
Nanakshahi calendar253
Thai solar calendar2263–2264
Tibetan calendar阳金鼠年
(male Iron-Rat)
1847 or 1466 or 694
    — to —
(female Iron-Ox)
1848 or 1467 or 695

Events change

Births change

  • April 19 - Roger Sherman, signer of the American Declaration of Independence (d. 1803)

Deaths change