- Mar 1 Rwanda ceded to Great Britain
- Mar 1 Sailors revolt in Kronstadt, Russia
- Mar 1 Spin bowler Arthur Mailey takes 5 for 119 (record 36 wickets for series) to lead Australia to a 9 wicket 5th Test win over England in Sydney; first ever, 5-0 Ashes cricket series win for Australia
Warren G. Harding
Mar 4 Warren G. Harding is inaugurated as the 29th President of the United States
- Mar 5 The Durban Land Alienation Ordinance passes, enabling the Durban City Council to exclude Indians from ownership or occupation of property in white areas, South Africa
- Mar 5 The US warns Costa Rica and Panama to settle disputes peacefully
- Mar 6 Police in Sunbury, Pennsylvania, issue an edict requiring Women to wear skirts at least 4 inches below the knee
- Mar 6 The Natal Indian Congress is resuscitated and reorganised at a meeting in Durban, with Ismail Gora as President
- Mar 8 Spanish Premier Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid.
Cairo Conference
Mar 12 Cairo Conference begins, British meeting to determine Middle Eastern policies, Gertrude Bell and T. E. Lawrence attend
- Mar 13 Mongolia (formerly Outer Mongolia) declares independence from China
- Mar 16 Britain signs a trade agreement with the USSR and sends a trade mission to Moscow: this goes against the US, who in the same month refused to sign a trade agreement
- Mar 17 Dr Marie Stopes opens Britain's 1st birth control clinic in London
Albert Anastasia Convicted
Mar 17 NY gangster Albert Anastasia is convicted of murdering longshoreman George Turino
- Mar 17 Sailors revolt in Kronstadt (thousands die)
- Mar 17 The Second Republic of Poland adopts the March Constitution
Lenin's Economic Policy
Mar 17 Vladimir Lenin proclaims the New Economic Policy to help the country recover from Russian Civil War
- Mar 18 2nd Peace of Riga, Poland enlarged
- Mar 18 80th Grand National: Fred Rees wins aboard 100/9 bet Shaun Spadah; winner is only horse to complete the course without falling
- Mar 18 Steamer "Hong Koh" runs aground off Swatow China killing 1,000
- Mar 19 Italian Fascists shoot from the Parenzana train at a group of children in Strunjan (Slovenia): two children are killed, two mangled and three wounded
- Mar 20 Upper Silesia votes for amalgamation with Germany in a plebiscite that is 63% in favor
- Mar 21 Walter Kerr Theater (Ritz, CBS, NBC, ABC) opens at 223 W 48th St NYC
- Mar 23 Germany announces it will be unable to meet its Great War reparation payments
- Mar 31 British coal miners goes on strike
Authors
Civil Rights Activists
Inventors
Kings
Revolutionaries
Scientists