- Mar 1 Major League Baseball Rules Committee rule that pitcher's mound must not be more than 15 inches higher than the baselines or home plate
Martha Washington Hotel
Mar 2 Martha Washington Hotel, catering to women only, opens in NYC
- Mar 3 North Carolina becomes 1st state requiring registration of nurses
- Mar 4 Stanley Cup, Montreal Arena, Westmount, Quebec: Montreal HC beats Winnipeg Victorias, 4-1 for a 2-1 challenge series victory
- Mar 5 Definitive treaty for construction of Baghdad railway drawn up
- Mar 10 Harry Gammeter of Cleveland patents multigraph duplicating machine
- Mar 12 New York Highlanders (Yankees) baseball franchise is approved as a member of the American League
- Mar 13 Fall of the Sokoto Caliphate in Northern Nigeria, the British claim supremacy on over 500,000 square miles
- Mar 14 1st national bird reservation established in Sebastian, Florida
- Mar 14 Stanley Cup, Dey's Arena, Ottawa, Ontario: Ottawa HC beats Rat Portage Thisles, 4-2 for a 2-0 challenge series sweep
- Mar 14 WB Yeats & Lady Gregory's "Hour-glass" premieres in Dublin
- Mar 18 Following through on its attacks on Roman Catholic institutions, the French Government dissolves the Catholic religious orders
Anthracite Coal Commission
Mar 22 US Anthracite Coal Commission, set up by President Theodore Roosevelt, submits its recommendations for shorter hours, a 10-per cent wage increase, and an 'open shop'
- Mar 23 The Wright brothers 1st file a patent for a flying machine, which is granted 3 years later
- Mar 25 Racing Club de Avellaneda, one of the big five of Argentina, is founded.
- Mar 26 American Hotel opens in Amsterdam
- Mar 27 65th Grand National: Percy Woodland aboard 13/2 chance Drumcree wins by 3 lengths from Detail
- Mar 31 Richard Pearse flies a monoplane several hundred yards in New Zealand
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