largest labour union in Great Britain throughout much of the 20th century. It originated in 1889 with the formation of the Dockers' Union. In 1922 that union led the merger of 14 unions to form an organization representing more than 300,000 workers. A dominant influence in the TGWU's formation and growth was Ernest Bevin (Bevin, Ernest), the union's first general secretary (1922–40).

As a general union, the TGWU maintained a policy of enrolling workers who had been excluded by the rigid requirements of the craft unions (craft union). As a result, the TGWU underwent remarkable growth, with membership exceeding two million in the 1970s. Members came from nearly all of the transportation industries (except railroads) and from automobile, construction, chemical, textile, and other industries. By organizing both semiskilled and unskilled workers, especially in smaller manufacturing trades, the general unions such as the TGWU represented workers traditionally ignored by the craft unions and industrial unions (industrial union).

The TGWU was characterized by an unusual degree of internal democracy and stability, and its relationships with the Trades Union Congress and the Labour Party allowed the union to exert considerable influence on general trade union policy in Britain. In recent years, however, the TGWU and other British trade unions have experienced significant declines in membership and influence.