The Swedish Wood Industry Workers' Union (Swedish: Svenska Träindustriarbetareförbundet, STIAF or Trä) was a trade union representing wood workers in Sweden.
Like its predecessor, it affiliated to the Swedish Trade Union Confederation.
The Swedish Cooperage Union merged in during 1936, followed in 1949 by the Swedish Sawmill Industry Workers' Union, and in 1962 by the saddlery section of the Swedish Saddlemakers' and Upholsterers' Union.
[1][2] Membership of the union peaked at 70,261 in 1979, then gradually declined.
In 1998, it merged with the Swedish Forest Workers' Union, to form the Swedish Forest and Wood Workers' Union.