1921 (MCMXXI) was a common year starting on Saturday in the Gregorian calendar and a common year starting on Friday in the Julian calendar. The Gregorian calendar was 13 days ahead of the Julian calendar. The Julian calendar remained in localized use until 1923.
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 19th century – 20th century – 21st century |
| Decades: | 1890s 1900s 1910s – 1920s – 1930s 1940s 1950s |
| Years: | 1918 1919 1920 – 1921 – 1922 1923 1924 |
| Gregorian calendar | 1921 MCMXXI |
| Ab urbe condita | 2674 |
| Armenian calendar | 1370 ԹՎ ՌՅՀ |
| Assyrian calendar | 6671 |
| Bahá'í calendar | 77–78 |
| Balinese saka calendar | 1842–1843 |
| Bengali calendar | 1328 |
| Berber calendar | 2871 |
| British Regnal year | 11 Geo. 5 – 12 Geo. 5 |
| Buddhist calendar | 2465 |
| Burmese calendar | 1283 |
| Byzantine calendar | 7429–7430 |
| Chinese calendar | 庚申年 (Metal Monkey) 4617 or 4557 — to — 辛酉年 (Metal Rooster) 4618 or 4558 |
| Coptic calendar | 1637–1638 |
| Discordian calendar | 3087 |
| Ethiopian calendar | 1913–1914 |
| Hebrew calendar | 5681–5682 |
| Hindu calendars | |
| - Vikram Samvat | 1977–1978 |
| - Shaka Samvat | 1842–1843 |
| - Kali Yuga | 5021–5022 |
| Holocene calendar | 11921 |
| Igbo calendar | 921–922 |
| Iranian calendar | 1299–1300 |
| Islamic calendar | 1339–1340 |
| Japanese calendar | Taishō 10 (大正１０年) |
| Javanese calendar | 1851–1852 |
| Juche calendar | 10 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4254 |
| Minguo calendar | ROC 10 民國10年 |
| Nanakshahi calendar | 453 |
| Thai solar calendar | 2463–2464 |
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 2047 or 1666 or 894 — to — 阴金鸡年 (female Iron-Rooster) 2048 or 1667 or 895 |
Events
- Albert Einstein receives the Nobel Prize in Physics.
- Partition of Ireland (May 3rd)
- Tulsa Race Massacre in Oklahoma, United States (May 31st-June 1st)
- Karl Gareis is murdered in Munich, Germany (June 9th)
- Insulin is invented in Canada by Frederick Banting and Charles Best (July 27th)
- Matthias Erzberger is murdered in Germany (August 25th)
- A hurricane devastates Tampa Bay, Florida (October 20th-October 30th)
- Anglo-Irish Treaty signed (December 6th)
Births
January
- January 5 – Jean, Grand Duke of Luxembourg (d. 2019)
- January 17 – Antonio Prohias Cuban-American cartoonist (d. 1998)
- January 19 – Patricia Highsmith, American writer (d. 1995)
- January 27 - Donna Reed, American actress (d. 1986)
- January 29 – Mustafa Ben Halim, 3rd Prime Minister of Libya (d. 2021)
- January 31 – Carol Channing, American actress and singer (d. 2019)
February
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- February 4 – Betty Friedan, American feminist, activist, and writer (d. 2006)
- February 4 – K. R. Narayanan, President of India (d. 2005)
- February 8 – Lana Turner, American actress (d. 1995)
- February 16 - Hua Guofeng, Chairman of the Communist Party of China (d. 2008)
- February 20 – Suharto, 2nd President of Indonesia (d. 2008)
- February 22 - Jean-Bédel Bokassa, 2nd President of the Central African Republic (d. 1996)
March
- March 21 – Abdul Salam Arif, 2nd President of Iraq (d. 1966)
- March 24 – Vasily Smyslov, Russian chess player (d. 2010)
- March 25 – Nancy Kelly, American actress (d. 1995)
April
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- April 9 - Yitzhak Navon, 5th President of Israel (d. 2015)
- April 14 – Thomas Schelling, American economist (d. 2016)
- April 25 – Karel Appel, Belgian artist (d. 2006)
May
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- May 2 – Satyajit Ray, Indian movie maker (d. 1992)
- May 3 – Sugar Ray Robinson, American boxer (d. 1989)
- May 21 – Andrei Sakharov, Soviet physicist and activist (d. 1989)
- May 25 – Jack Steinberger, German-American physicist (d. 2020)
June
- June 10 – Prince Philip, Duke of Edinburgh, member of the British royal family, husband of Queen Elizabeth II (d. 2021)
- June 21 – Jane Russell, American actress (d. 2011)
July
- July 6 – Nancy Reagan, First Lady of the United States (d. 2016)
- July 14 – Geoffrey Wilkinson, English chemist (d. 1996)
- July 18 – John Glenn, American astronaut and politician (d. 2016)
- July 24 – Giuseppe Di Stefano, Italian operatic tenor (d. 2008)
August
- August 8 – Esther Williams, American swimmer and actress (d. 2013)
September
- September 1 – Willem Frederik Hermans, Dutch writer (d. 1995)
- September 30 – Deborah Kerr, Scottish actress (d. 2007)
- September 30 – Sagramor de Scuvero Brandão, Brazilian actress, radio personality and councillor (d. 1995)
October
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- October 4 – Francisco Morales-Bermúdez, 112th Prime Minister and 51st President of Peru (d. 2022)
- October 19 – Gunnar Nordahl, Swedish footballer (d. 1995)
November
December
- December 26 – Steve Allen, American actor, comedian, composer, and writer (d. 2000)
Deaths
January
February
March
- March 1 – King Nicholas I of Montenegro (b. 1841)
April
May
June
July
- July 4 – Antoni Grabowski, early proponent of Esperanto (b. 1857)
August
September
October
November
December
Sports
- Kentucky Derby winner, Behave Yourself
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