Tammi, also known as Kustannusyhtiö Tammi and Tammi Publishers,[1][2] is a Finnish publishing company established in 1943 by an initiative of Väinö Tanner, leader of the Social Democratic Party of Finland. In 1996, the company was bought by the Bonnier Group, and, as of the early 2000s, it was the third largest book publisher in Finland.[3] In 2018, the company was merged into the Finnish book publishing company Werner Söderström Osakeyhtiö (WSOY). Tammi was formerly known as Kustannusosakeyhtiö Tammi.[4]
Its series Keltainen kirjasto (Yellow library), published since 1954, specialises in "quality literature", including books by many recipients of the Nobel Prize in Literature.[5]