The American Labor Union (ALU) was a radical labor organization established by the Western Federation of Miners (WFM) on this day in 1898, a group which would go on to help found the Industrial Workers of the World (IWW).

The organization was founded by the WFM in an effort to build a federation of trade unions in the aftermath of the failed Leadville Miners' Strike of 1896. The strike's defeat had marked a turning point for the WFM, which abandoned the American Federation of Labor's craft unionism in favor of more militant tactics.

At its peak, the ALU had about 43,000 members, 27,000 of which were members of the WFM. The ALU was an important precursor to the Industrial Workers of the World (IWW), which it helped found in 1905 and was effectively absorbed into.