Significant dates in labour history.
- June 01 - Matthew Woll died; the United Farm Workers conducted its first strike in 1966 in Texas; the Cananea strike began in 1906 in Mexico
- June 02 - During the 1952 steel strike, the U.S. Supreme Court decided Youngstown Sheet & Tube Co. v. Sawyer; the Child Labor Amendment was adopted by the U.S. Congress; Charles Moyer died
- June 03 - The U.S. Supreme Court decided Hammer v. Dagenhart, outlawing child labor laws; Victor G. Reuther died; Emmanuel Christopher Loblack died
- June 04 - The Amalgamated Association of Iron and Steel Workers affiliated with the CIO; Lou Cunningham was born
- June 05 - Teamsters for a Democratic Union was formed; the U.S. Supreme Court decided Hague v. CIO; the California Agricultural Labor Relations Act became law
- June 06 - Don Farrell was born; CUPE 3902 was founded; N. M. Perera was born; Thomas Jackson died
- June 07 - The Steel Workers Organizing Committee was founded; the Matignon Agreements ended a general strike in 1936 in France; John Willcock died
- June 08 - Robert Lee Hill was born; Emil Rieve was born; Percy Wells was born
- June 09 - R. J. Thomas was born
- June 10 - The U.S. Supreme Court decided Anderson v. Mt. Clemens Pottery Co.; Frank Hayes died
- June 11 - John L. Lewis died; the Federación Sindical de Trabajadores Mineros de Bolivia was founded; José Bové was born
- June 12 - The 1981 Major League Baseball strike began in the U.S. and Canada; Philip Vera Cruz died
- June 13 - Israel Kugler was born; Tony Mazzocchi was born
- June 14 - 1911 Liverpool general transport strike began in the U.K.; government troops triggered the 2006 Oaxaca protests in Mexico
- June 15 - The Metal Trades Department, AFL–CIO was founded
- June 16 - Dave Beck was born
- June 18 - Battle of Ballantyne Pier occurred in Canada in 1935; the Battle of Orgreave occurred in 1984 in the U.K.
- June 19 - Nelson Cruikshank died; John W. Brown died; Tanong Po-arn disappeared
- June 20 - The American Railway Union was founded; Jim Bacon died; Evelyn Dubrow died; Alphonse Verville died
- June 21 - Nelson Cruikshank was born; the Herrin massacre occurred in 1922 in the U.S.; the U.S. Supreme Court decided United States v. Congress of Industrial Organizations; the "Molly Maguires" were hanged in the U.S.; Frank Drozak died
- June 22 - Riots occurred during the Grunwick dispute in 1976 in the U.K.; Paul Hall died; the U.S. Supreme Court decided Burlington Northern Railway v. White; the Sheffield Trades and Labour Council was founded; John Marius Trana was born
- June 23 - The Taft–Hartley Act became law in the U.S.
- June 24 - Terence V. Powderly died, Agnes Nestor was born
- June 25 - Winnipeg general strike of 1919 ended; the Smith–Connally Act became law in the U.S.
- June 26 - Timothy D. Murphy died; the Alliance of Concerned Teachers was formed; John W. Brown died; Emma Miller was born
- June 27 - The 1949 Australian coal strike began; the Industrial Workers of the World was founded; the Bureau of Labor Statistics was formed in the U.S.
- June 28 - President Grover Cleveland signed legislation establishing Labor Day in the U.S.; Alfred Miodowicz was born; Vere Bird died
- June 29 - The National Labor Relations Board was created; a lockout triggered the Homestead Strike; the merger of the blacksmiths and boilermakers formed the International Brotherhood of Boilermakers; Edward J. Carlough died; the U.S. Supreme Court decided Communications Workers of America v. Beck
- June 30 - Former labor union official Tomiichi Murayama became Prime Minister of Japan