The Wood Workers' Union (Finnish: Puutyöväen liitto, SPL) was a trade union representing wood industry workers in Finland.
Later that year, supporters of the Social Democratic Party (SDP) founded a new Finnish Wood Workers' Union, which affiliated to the Finnish Federation of Trade Unions (SAK).
By 1958, the SDP supporters had been marginalised in the SAK, leading the Wood Workers to disaffiliate.
The SAK and SAJ merged in 1969, forming the Central Organisation of Finnish Trade Unions, which both the SPL and the PTTL joined.
The PTTL finally rejoined the SPL in 1973, which renamed itself as the "Wood Workers' Union".