- Mar 1 Germany's prohibition of Communist Party KPD lifted
- Mar 3 German & Turkish friendship/trade treaty signed
- Mar 3 Sean O'Casey's "Juno & the Paycock" premieres in Dublin
- Mar 4 "Happy Birthday To You" published by Claydon Sunny
- Mar 5 Computing-Tabulating-Recording Corp becomes IBM
- Mar 5 Frank Carauna, becomes 1st to bowl 2 successive perfect 300 games
- Mar 5 King Hussein of Hedzjaz appoints himself kalief
- Mar 6 British Labour government cuts military budget
- Mar 8 Coal mine explosion kills 171 at Castle Gate, Utah
- Mar 9 South Slavia aproves Italy's annexation of Fiume (Rijeka)
- Mar 11 3rd term of Belgium Theunis government begins
- Mar 11 Eden Phillpotts' "Farmer's Wife" premieres in London
Benito Mussolini
Event of Interest
Mar 17 Eugene O'Neill's "Welded" premieres in NYC
Eugene O'Neill
- Mar 17 Netherlands & USSR begin talks over USSR recognition
- Mar 17 Sweden & USSR exchange diplomats
- Mar 20 Finnair begins scheduled flight of Helsinki-Tallinn
- Mar 21 1st foreign language course broadcast on US radio (WJZ, NYC)
- Mar 21 Mass Investors Trust becomes 1st mutual fund set up in US
- Mar 24 Greece becomes a republic
- Mar 25 Greek parliament selects admiral Paul Koundouriotis as premier
- Mar 26 Premiere of Bernard Shaw's "Saint Joan" in London
- Mar 27 Canada recognizes USSR
- Mar 27 New French government of Poincaré begins
- Mar 28 WGN-AM in Chicago IL begins radio transmissions
- Mar 29 Bavaria & Vatican reach accord
- Mar 31 Croydon Airport, London: Imperial Airways established
- Mar 31 London public transport strike ends