The World Federation of Trade Unions (WFTU) is an international federation of trade unions established in 1945. Founded in the immediate aftermath of World War Two, the organization built on the pre-war legacy of the International Federation of Trade Unions as a single structure for trade unions world-wide, following the World Trade Union Conference in London, United Kingdom.

A trade union or labor union, often simply referred to as a union, is an organization of workers whose purpose is to maintain or improve the conditions of their employment, such as attaining better wages and benefits, improving working conditions, improving safety standards, establishing complaint procedures, developing rules governing status of employees and protecting and increasing the bargaining power of workers.