|Full name||International Union of Operating Engineers (IUOE)|
|Founded||December 7, 1896|
|Affiliation||AFL-CIO, CLC, NAMTU|
|Key people||James T. Callahan, General President|
|Office location||Washington, D.C.|
|Country||United States, Canada|
The International Union of Operating Engineers (IUOE) is a trade union within the United States-based AFL-CIO representing primarily construction workers who work as heavy equipment operators, mechanics, surveyors, and stationary engineers (also called operating engineers or power engineers) who maintain heating and other systems in buildings and industrial complexes, in the United States and Canada.
Founded in 1896, it currently represents roughly 400,000 workers in approximately 170 local unions and operates nearly 100 apprenticeship programs.
IUOE Local 3, based in Alameda, California, is the largest building and construction trades local in the U.S., with jurisdiction covering four states: California, Nevada, Hawaii and Utah. Most of Local 3's 42,600 members work as heavy equipment operators, and construction workers, but the local also represents public employees, such as maintenance workers and peace officers, Technical Engineers, Surveyors and Construction Inspectors as well as Building Inspectors. Local 3 is headed by Business Manager Dan Reding.
Over 11,000 members: dam builders, crane and heavy equipment operators, road builders, aerial firefighters and mechanics.
Local 137 represents the Operating Engineers in the counties of Westchester, Putnam and parts of Southern Dutchess. The branch is headquartered in Briarcliff Manor, New York, in a former dairy processing building for Briarcliff Farms.
Local 115, based in Burnaby, British Columbia Canada, represents over 10,000 skilled workers in construction, road building, transportation, mining, aviation and various industrial sectors throughout British Columbia and the Yukon. Local 115's Business Manager is Brian Cochrane and its President is Wayne Mills. Local 115 runs a Training Institute that is accredited with Private Career Training Institutions and delivers programs in accordance with British Columbia's Industry Training Authority.
In 2013, IUOE Local 115, along with the BC Building Trades Union, had tried to overturn permits given to a Murray River coal mine near Tumbler Ridge, British Columbia to hire 201 Chinese temporary workers to work on a new mine owned by Chinese nationals. The unions claimed that the job ads were written to exclude Canadian workers, and instead chose to hire Chinese workers for lower wages rather than source or train local miners from the immediate area or the province.
However, a federal court judge disagreed. Russell Zinn found that HD Mining, the owner of the coal mine, had fulfilled the requirements set out in a federally mandated Labour Market Opinion (LMO) and dismissed the unions' challenge. However, public and media attention on the case resulted in some changes being implemented into the Canadian Temporary Foreign Worker Program to ensure that foreign workers are not chosen over local resources, where available. 
Local 150, based in Countryside, Illinois, is the second-largest local in the International (23,000 + Members) with jurisdiction in parts of three states: Illinois, Indiana and Iowa. Local 150's President and Business Manager is James "Jim" Sweeney. Local 150 represents the most traditional Operating Engineers (Hoisting and Portable, Heavy-Highway, Building Trade, Quarry, Landfill, and Underground) employees in the International. Local 150 has an advanced Operating Engineers (Hoisting and Portable) apprenticeship program.
Local 399, based in Chicago, represents more than 10,000 working men & women in Illinois and northwest Indiana.
Local 501 was formed in 1953 by the merger of several regional locals and has offices in Los Angeles and Las Vegas. The Business Manager is Edward J. Curly. Members perform maintenance and repair of all HVAC equipment, boiler operation, lighting, plumbing, welding, painting, carpentry, or in general, all trade related maintenance and repair.
IUOE Local 612 covers Tacoma, Washington.
Local 825 covers New Jersey and the 'lower counties' (Rockland, Orange, Ulster, Sullivan & Delaware) of New York State. The Local 825 Business Manager is Greg Lalevee. The Local 825 training center is located adjacent to the NJ Turnpike.
represents crane and heavy equipment operators in Ontario's construction industry
represents a membership of approximately 2,200 people in Newfoundland and Labrador