Association of Atheists and Freethinkers (Polish: Stowarzyszenie Ateistów i Wolnomyślicieli [SAIWA]) is a non-governmental organization founded in 1957 that aims to actively participate in the process of secularization of Polish society. The group is active in popularizing scientific knowledge about religion, creating a Polish secular culture and secular ethics as well as in promoting the rationalistic and materialistic view of the world, and working to limit the place of clericalism.^[1]

The organization continued in the tradition of pre-war Polish Association of Freethinkers, a group which was dominated by Communist Party activists, academics, and journalists.

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