The Union of Freethinkers of Finland (Finnish: Vapaa-ajattelijain Liitto ry, Swedish: Fritänkarnas Förbund rf)^[1] is the largest secularist and freethought organisation in Finland. The organisation supports the rights of those Finns who hold no religious affiliation, and promotes a science-based, rational and critical world view and humanistic ethics.^[2]

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The organisation was founded in 1937 under the name the Union of Civil Register Associations (Finnish: Siviilirekisteriläisyhdistysten keskusliitto).^[3]

The Tampere section of the organisation created the Eroakirkosta.fi website in 2003, which offers an electronic service for resigning from Finland's state churches.^[4]