The Laborers' International Union of North America (LIUNA, often shortened to just the Laborers' Union) is an American and Canadian labor union formed in 1903. As of 2005, they have over 550,000 members. The 300,000 associate members of the Mail Handler's division of LIUNA are not members, are not covered by LIUNA collective bargaining agreements and are not eligible to vote in LIUNA elections.

The union includes workers involved in construction, waste management, stone cutters, lumberjacks, cleaning and domestic staff, security and mining. One of the Postal Service unions (the National Postal Mail Handlers Union), the National Federation of Independent Unions and the Canadian National Federation of Independent Unions are all affiliated with the LIUNA.

The LIUNA is divided into nine regions across North America; these regions are further divided into a total of just over 500 local unions.