Americans United for Separation of Church and State is a nonpartisan educational and advocacy organization dedicated to advancing the constitutional principle of church-state separation as the only way to ensure freedom of religion, including the right to believe or not believe, for all Americans.

We envision an America where everyone can freely choose a faith and support it voluntarily, or follow no religious or spiritual path at all, and where the government does not promote religion over non-religion or favor one faith over another.


AU is a 501(c)(3) nonprofit educational organization based in Washington, D.C. Founded in 1947, we work in the courts, in Congress and state legislatures, at the White House and in the arena of public opinion. We are led by Executive Director Barry W. Lynn and governed by AU's Board of Trustees.

We address an array of pressing issues. We encourage you to learn about our projects, lawsuits and out-of-court successes. For a detailed account of AU activities in the past year, check our Annual Reports & Audited Financial Documents.

If you share our commitment to church-state separation, please join with us today. We welcome your support in this important cause.