- Mar 2 1st US indoor glider flight, St Louis Terminal Building
- Mar 4 Coolidge Dam in Arizona dedicated
- Mar 4 Emma Fahning bowls 1st sanctioned 300 game by a woman
- Mar 4 Terrible floods ransack Languedoc and the surrounds in south-west France, resulting in twelve departments being submerged by water and causing the death of over 700 people.
- Mar 7 Georgetown High of Chicago defeats Homer 1-0 in basketball
- Mar 7 NY Times agrees to capitalize the n in "Negro"
The Rise and Fall of the City of Mahagonny
Mar 9 Kurt Weill and Bertolt Brecht's satirical opera "The Rise and Fall of the City of Mahagonny" premieres in Leipzig, Germany
Appointment of Interest
Mar 11 Hans Luther is appointed as president of the Reichsbank.
- Mar 11 William Taft, American 27th President & Chief Justice buried in Arlington Cemetery
Salt March
Mar 12 Mahatma Gandhi begins his famous 200 mile (300km) protest march against the widely hated British salt tax
- Mar 12 Stanislawa Walasiewicz [Stella Walsh] sets world record for the 220-yard dash (0:26.1)
- Mar 13 Clyde Tombaugh announces discovery of Pluto at Lowell Observatory
- Mar 15 1st seaplane glider flown at Port Washington, NY
- Mar 15 1st streamlined submarine of US navy, USS Nautilus, launched
- Mar 16 USS Constitution (Old Ironsides) floated out to become a national shrine
- Mar 17 Construction begins of the Empire State Building, the world's 1st skyscraper of 100+ stories, on 5th Avenue in New York City
- Mar 18 Boston Bruins win record 20th NHL home game
- Mar 19 Nakagawa Soen accepted as a student of Katsube Keigaku Roshi
- Mar 20 American engine builder Clessie Cummins sets diesel engine speed record of 80.4 mph (129.39 kph)
Sanders Court & Café
Mar 20 American fast food restaurant chain "KFC" [Kentucky Fried Chicken] is founded as Sanders Court & Café by Colonel Harland Sanders in North Corbin, Kentucky
Vinson Again US Champion
Mar 23 US Ladies Figure Skating championship won by Maribel Vinson
Piston's Suite for Orchestra
Mar 28 1st performance of Walter Piston's Suite for orchestra (Boston)
Istanbul – The Queen of Cities
Mar 28 Turkish cities Constantinople and Angora change their names to Istanbul and Ankara
- Mar 29 89h Grand National: 10-year-old 100/8 shot Shaun Goilin, ridden by jockey Tommy Cullinan, wins by a neck from Melleray's Belle
- Mar 29 Heinrich Brüning is appointed German Chancellor
- Mar 30 Babberich-H soccer team forms
- Mar 31 The Motion Pictures Production Code is instituted, imposing strict guidelines on the treatment of sex, crime, religion and violence in film for the next 38 years