- Mar 3 1st US federal cemetery with Union & Confederate graves opens, Missouri
- Mar 4 Victor Berger (Wisc) becomes 1st socialist congressman in US
- Mar 7 US sends 20,000 troops to Mexican border
- Mar 7 Willis Farnsworth of Petaluma, California, patents coin-operated locker
- Mar 13 Ivan Caryll's musical "The Pink Lady" premieres at the New Amsterdam Theatre, NYC; runs for 336 performances
- Mar 13 Stanley Cup, Dey's Arena, Ottawa, ON: Ottawa Senators beat Galt (ON), 7-4
- Mar 13 The Colonial-Born and Settlers Indian Association is formed at a meeting in Durban, South Africa, and has at its aim to fight the infamous 3 poll tax
- Mar 16 Stanley Cup, Dey's Arena, Ottawa, ON: Ottawa Senators beat Port Arthur Bearcats (ON), 13-4
- Mar 18 North Dakota enacts a hail insurance law
- Mar 19 1st International Women's Day sees over 1 million men and women attend rallies in Austria, Denmark, Germany and Switzerland. Issues discussed included women's right to vote and to hold public office, the right to work, to vocational training and an end to discrimination on the job.
- Mar 20 National Squash Tennis Association forms (NYC)
- Mar 20 Winter Garden Theater opens at 1634 Broadway NYC
- Mar 24 73rd Grand National: legendary jockey Jack Anthony wins his first of 3 GN's aboard 20/1 Glenside in torrential rain
- Mar 25 L. D. Swamikannu publishes "Manual of Indian Chronology" in Bombay
- Mar 25 Triangle Shirtwaist Factory catches fire 145 die, all but 13 girls in Greenwich Village, New York
- Mar 30 Lötschberg tunnel in Switzerland (13,735 m) completed
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