The Union of Communication Workers was a trade union in the United Kingdom for workers in the post office and telecommunications industries. It was founded in 1919 as the Union of Post Office Workers by the merger of the Postmen's Federation, Postal and Telegraph Clerks' Association and the Fawcett Association. It achieved official recognition, and as a result, in 1920 the London Postal Porters' Association, Central London Postmen's Association, Tracers' Association, Tube Staff Association, Messengers' Association and Sorters' Association all merged with it. Its longest strike was for 7 weeks in 1971
It changed its name in 1980, and merged with the National Communications Union in 1995 to form the Communication Workers' Union.