- Mar 3 International Greyhound Racing Association formed (Miami, Fla)
- Mar 4 De Geer government in Netherlands takes office
- Mar 6 China asks for a seat on the Security council
- Mar 7 1st transatlantic telephone call (London-NY)
- Mar 9 Bertha Landes elected 1st woman mayor of Seattle and 1st female mayor of any major US city
- Mar 10 Run on Belgian banks
- Mar 11 Eamon da Valera ends leadership of Sinn Féin
- Mar 12 Denmark begins unilateral disarmament
- Mar 12 Pope Pius XI names J E van Roey archbishop of Malines Belgium
- Mar 14 Train in Costa Rica falls into the Río Virilla, killing 248 and injuring 93
- Mar 15 Belgium's "black monday", franc falls
1st Liquid-Fueled Rocket
Mar 16 Robert H. Goddard launches the first liquid-fueled rocket, goes 184' (56 meters)
- Mar 17 Dutch Calvinists oust Rev J G Geelkerken over Genesis 3
The Girl Friend
Mar 17 Richard Rodgers and Lorenz Hart's musical "The Girl Friend", starring Sammy White and Eva Puck, opens at the Vanderbilt Theatre, NYC; runs for 301 performances
- Mar 17 Spain & Brazil prevent Germany joining League of Nations
- Mar 24 The Beehive in the Hague opens 1st escalator in Netherlands
- Mar 26 85th Grand National: Billy Watkinson victorious aboard 25/1 bet Jack Horner; first Australian jockey to win the race
- Mar 26 ACD de Graeff appointed governor general of Dutch East Indies
- Mar 26 First lip-reading tournament held in America
- Mar 31 German Special Court of Justice for state security disbands
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