The Union of Freethinkers of Finland (Finnish: Vapaa-ajattelijain liitto) is the largest secularist and freethought organization in Finland. The organization supports the rights of those Finns who hold no religious affiliation, and promotes a science-based, rational and critical world view and humanistic ethics. The organization was founded in 1937 under the name the Union of Civil Register Associations (Finnish: Siviilirekisteriläisyhdistysten keskusliitto).