The Amalgamated Transit Union is the largest labor organization representing transit workers in the United States and Canada. Founded in 1892, the ATU today is comprised of over 190,000 members in 264 local unions spread across 46 states and nine provinces.

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The Union is guided by a triennial convention at which delegates chosen by locals meet to debate and direct the future of the Union. The International officers consist of the International President, the International Executive Vice President, the International Secretary-Treasurer, and 18 International Vice Presidents and six International Representatives. The International Vice Presidents serve on the Union's General Executive Board.

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The office of the International President is currently held by John Costa.

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The ATU is comprised of bus, van, subway and light rail operators, customer service representatives, baggage handlers and maintenance/utility employees in urban transit, over-the-road and school bus industries; as well as emergency medical service personnel, ambulance operators, clerical personnel, and municipal workers. The ATU can be found in most major cities of the United States and Canada.

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 The ATU  is afffiliated with American Federation of Labor Industrial Organization and Canadian Labor Congress.