The Swedish Building Workers' Union (Swedish: Svenska Byggnadsarbetareförbundet, Byggnads) is a trade union representing workers in the construction industry in Sweden.

The union was established on 1 January 1949, when the Swedish Building Wood Workers' Union merged with the labourers' section of the Swedish Factory Workers' Union, the plumbers' section of the Swedish Metalworkers' Union and the construction workers' section of the Swedish Road Workers' Union.

Despite these mergers, by 2019, the union's membership had dropped to 80,472, slightly over half its strength compared to the union's mid-1960s heydays.

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