Events in History
- Mar 1 Austria becomes a kingdom again, under Admiral Horthy
- Mar 1 Buriat ASSR, in RSFSR, constituted
- Mar 1 Nikolaus Horthy is elected Regent of Hungary, which had adopted a constitution on 28 February
- Mar 2 Karel Čapek "Loupeznik" premieres in Prague
- Mar 4 Last day of Julian civil calendar in Greece
- Mar 8 Denmark & Cuba join the League of Nations
- Mar 10 Home Rule Act passed by the British Parliament, dividing Ireland into two parts; it is rejected by the southern counties, where the Ango-Irish war continues for a year
- Mar 11 Syria proclaims Emir Feisal king after the country has fought off French domination
- Mar 13 After the German government is forced to cut its army to 10,000 men, military groups plot an unsuccessful coup - a revolt ended by a general strike
- Mar 16 1 Acre Park also known as Baby Park in the Bronx renamed Melrose Park
- Mar 19 US Senate rejects Treaty of Versailles for 2nd time refusing to ratify League of Nations' covenant (maintaining isolation policy)
- Mar 20 1st flight from London to South Africa lands (took 1½ months)
- Mar 20 US Ladies' Figure Skating championship won by Theresa Weld
- Mar 23 Perserikatan Communist of India (PKI) political party forms
- Mar 24 1st US coast guard air station established (Morehead City, NC)
- Mar 25 Greek Independence Day
- Mar 27 Hermann Muller becomes German chancellor (SPD)
Election of Interest
Mar 28 Tomáš Masaryk elected President of Czechoslovakia

Tomáš Garrigue Masaryk
- Mar 28 Palm Sunday tornado outbreak of 1920 affects the Great Lakes region and Deep South states
- Mar 28 Anton Denkin's White Russian troops defeated by Bolsheviks and Soviets at Novorossijsk on the Black Sea (The British aid Denkin in his escape)
- Mar 31 British parliament accepts Irish Home Rule law
Birthdays in History
- Mar 1 Howard Nemerov, American 3rd US poet laureate/novelist (Blue Swallows)
- Mar 4 Marcella Grady Jennings, rancher
- Mar 4 Jean Lecanuet, French politician (d. 1993)
- Mar 5 Delbert L. Latta, American politician (Rep-R-OH, 1959-89), born in Weston, Ohio (d. 2016)
- Mar 5 Leontine Tg Kelly, 1st African American female bishop (Methodist)
- Mar 5 José Aboulker, Jewish Communist
- Mar 10 Alfred Peet, Dutch-American entrepreneur and the founder of Peet's Coffee & Tea (d. 2007)
- Mar 11 D J Enright, England, poet/novelist (Some Men are Brothers)
- Mar 11 Henry Marking, CEO (British Airways)
- Mar 11 Kenneth Dover, chancellor (St Andrews University)
- Mar 13 Frans van der Elst, Belgian attorney and MP (Volksunie), born in Neder-Over-Heembeek, Belgium (d. 1997)
- Mar 13 Ralph J Roberts, American businessman and founder of Comcast, born in NYC, New York (d. 2015)
- Mar 14 Hank Ketcham, cartoonist (Dennis the Menace)
- Mar 15 Lawrence Sanders, American novelist (d. 1998)
- Mar 15 E. Donnall Thomas, American physician, Nobel Prize in Physiology or Medicine
- Mar 15 Sid Hartman, American sports journalist (Minneapolis Star Tribune; WCCO 830 AM), born in Minneapolis, Minnesota (d. 2020)
- Mar 16 Traudl Junge, German secretary to Adolf Hitler, born in Munich (d. 2002)
- Mar 16 Dorothea Binz, Nazi war criminal (d. 1947)
- Mar 16 Sid Fleischman, American author
- Mar 18 Eric Halsall, sheepdog trial commentator
- Mar 19 Kjell Aukrust, Norwegian author (d. 2002)
- Mar 20 Douglas G Chapman, biomathematical statistician
- Mar 21 Georg Ots, Estonian singer (d. 1975)
- Mar 26 George E Brown Jr, (Rep-D-CA, 1963-71, 73- )
- Mar 27 Robin Jacques, English illustrator, born in Chelsea (d. 1995)
- Mar 28 Eugene A. Chappie, American politician, U.S. House of Representatives from California, born in Sacramento, California (d. 1992)
- Mar 28 Lord Butterfield [John Butterfield], British medical researcher, clinician and administrator, born in Stechford, Birmingham (d. 2000)
- Mar 29 John M. Belk, American head of Belk, Inc., born in Charlotte, North Carolina (d. 2007)
- Mar 31 Marga [Sara Voeten-] Minco, Dutch writer (Bitter Herb)
- Mar 31 Deborah "Debs" Cavendish, Duchess of Devonshire and the Chatsworth estate, one of the Mitford sisters, born in Gloucestershire (d. 2014)
Deaths in History
- Mar 1 Joseph Trumpeldor, Zionist activist, killed defending Tel-Mai against arab attack
- Mar 1 John H. Bankhead, U.S. Senator from Alabama, dies at 77
- Mar 3 Theodor Philipsen, Danish painter, dies at 79
- Mar 8 Rafael Obligado, Argentine writer (Santos Vega), dies at 69
- Mar 8 Wilhelm Bousset, German theologist and historian, dies at 54
- Mar 11 Julio Garavito Armero, Colombian astronomer (b. 1865)
- Mar 20 Venustiano Carranza, president Mexico (1915-20), murdered at 60
- Mar 21 Federigo Tozzi, Italian writer/journalist (Torre, Tre Croci), dies at 37
- Mar 26 William Chester Minor, American surgeon and contributor to the Oxford English Dictionary (b. 1834)
- Mar 27 Johan G Danser, Dutch poet (Meetings), dies at 26