The Swedish Building Wood Workers' Union (Swedish: Svenska Byggnadsträarbetareförbundet, Btaf) was a trade union representing carpenters in Sweden.
On 1 January 1924, the Wood Workers' Union was split into the Swedish Wood Industry Workers' Union and a new Btaf.
Like its predecessor, it affiliated to the Swedish Trade Union Confederation.
In 1925, the small Swedish Parquet Layers' Union joined Btaf.
In 1949, it merged with parts of several other unions, to form the Swedish Building Workers' Union.