- Mar 1 Federal Trade Commission orders 8 manufacturers and the PGA of America to end their practice of golf ball price-fixing
- Mar 2 Landslides & floods cause over 200 deaths (Los Angeles California)
- Mar 2 Trials of Soviet leaders begins in the Soviet Union
- Mar 3 American Bowling Congress' largest tournament (24,765 competitors)
Jezebel
Mar 10 "Jezebel" film premieres directed by William Wyler, starring Bette Davis and Henry Fonda, from the play by Owen Davis
10th Academy Awards
Mar 10 10th Academy Awards: "The Life of Emile Zola", Spencer Tracy & Luise Rainer win
- Mar 11 Artur Seyss-Inquart replaces Kurt von Schuschnigg as Chancellor of Austria; German troops also entered the country
- Mar 12 Nazi Germany invades Austria (Anschluss)
- Mar 13 In a process known as Anschluss, Austria is annexed into Nazi Germany
- Mar 13 World News Roundup is broadcast for the first time on CBS Radio in the United States.
Operette
Mar 16 Noël Coward's musical "Operette" premieres in London
- Mar 16 Temple defeats Colorado to win 1st NIT
Italy Bombs Spain
Mar 17 The Italian Air Force, in support of Francisco Franco, bombs Barcelona during the Spanish Civil War
- Mar 18 NY 1st requires serological blood tests of pregnant women
- Mar 18 President Cardena of Mexico nationalizes US & British oil companies
- Mar 19 NHL Toronto Maple Leafs and New York Americans combine to score 8 goals in just under 5 minutes; Toronto wins game 8-5
- Mar 19 Scotland beats England, 21-16 at Twickenham, London to win the Home Nations Rugby Championship, Triple Crown and Calcutta Cup
Commissioner Frees Cardinals
Mar 23 MLB Commissioner Kenesaw Mountain Landis frees 74 St Louis Cardinals minor league players from their contracts
- Mar 25 97th Grand National: 17-year-old jockey Bruce Hobbs wins aboard 40/1 Battleship; first US bred and owned winner; only horse to win GN and American Grand National (1934)
Hanson's 3rd Symphony
Mar 26 NBC radio performance of Howard Hanson's 3rd Symphony
- Mar 27 The Battle of Taierzhuang takes place.
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