Significant dates in labour history.
- March 01 - Joseph Curran was born; the S.S. California strike began in 1936 in the U.S.; the South Korean railroad strike of 2006 began; the Australian Rail Tram and Bus Industry Union was founded; Tinos Rusere died; Clinton Jencks was born
- March 02 - The Steel Workers Organizing Committee signed a first contract with U.S. Steel; the Confederation of Labour of Kazakhstan was founded
- March 03 - William Green was born; Frances Perkins became U.S. Labor Secretary and the first female member of the Cabinet; Joseph Yablonski was born
- March 04 - Shannon J. Wall was born; the formation of SLOMR was announced in Romania; Sam Pollock died; Art Babbitt died; the South Korean railroad strike of 2006 ended; Joseph Ashby died
- March 05 - The UK miners' strike of 1984–1985 began; Thomas Devin Reilly died
- March 06 - The Sailors' Union of the Pacific was founded; Richard Frankensteen was born; James Thompson Bain was born; the 1912 Brisbane general strike ended in Australia
- March 07 - The 2003 Broadway Musicians Strike began in the U.S.
- March 08 - Buzz Hargrove was born; Rhoda Williams died
- March 09 - Westmoreland County Coal Strike of 1910–1911 began; Ernest Bevin was born; Amir Peretz was born; John Golding was born
- March 10 - Morgan Tsvangirai was born
- March 11 - Ron Todd was born; Jack Egerton was born
- March 12 - Lane Kirkland was born; the first employer agreed to union demands, effectively ending the Lawrence textile strike in the U.S. in 1912; Edward Grayndler died; Andrew Furuseth was born
- March 13 - Ami Chandra died; Irmã Dulce died; Paul Mattick was born
- March 14 - The Asbestos Strike began in Canada in 1949; the film Salt of the Earth was released in 1953; Michael Foster was born
- March 15 - A major insider-trading scandal was exposed at the Union Labor Life Insurance Company in the U.S.; William McFetridge died; William Broadhead died
- March 16 - The Bydgoszcz events began in Poland in 1981; Lloyd McBride was born; James Petrillo was born; the United Federation of Teachers was founded; Samizu Matsuki was born
- March 17 - Edward J. McElroy was born; P. H. McCarthy was born; Edward William O'Sullivan was born
- March 18 - The U.S. postal strike of 1970 began Seymour Martin Lipset was born
- March 19 - The Bituminous Coal Strike of 1977-1978 ended in the U.S.
- March 20 - The U.S. Supreme Court decided Teamsters v. Terry; the General Union of Moroccan Workers was founded; the Structural Building Trades Alliance was founded
- March 21 - The Australian Industrial Relations Commission decided the Three certified agreements case in 2005; the U.S. Supreme Court decided National Treasury Employees Union v. Von Raab; Alice Henry was born
- March 22 - Ron Carey was born; Matthew Guinan died; Roy Lee Williams was born; Thomas Helliker died
- March 23 - Coalition of Labor Union Women was founded; Christiane Brunner was born; Kate Bronfenbrenner was born; Edward Lamb died; Will H. Daly died; the Andhra Pradesh Federation of Trade Unions was founded; Lou Cunningham died; Basawon Singh (Sinha) was born; Sigurd Lucassen died
- March 25 - The Triangle Shirtwaist Factory fire occurred; the Argentine Regional Workers' Federation was founded; Paul Mackney was born
- March 26 - Hugh Mulzac was born; the Alberta Union of Provincial Employees was founded; James Callaghan died
- March 27 - James Callaghan was born; WorkChoices entered into force in Australia in 2006
- March 29 - The U.S. Supreme Court decided West Coast Hotel Co. v. Parrish; John Ducker was born
- March 30 - The New York State United Teachers is founded
- March 31 - César Chávez was born; GMB was founded; MEA-MFT was founded; Mei Li Vos was born