American Atheists
Cranford, NJ, USA
Both
National non-profit defending the civil liberties of atheists and advocating complete separation of church and state. Founded 1963 by Madalyn Murray O'Hair.
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American Humanist Association
Washington DC, USA
Both
Oldest and largest U.S. group advancing secular humanism - promoting ethics and values without a god, providing humanist ceremonies, and lobbying for church-state separation.
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Atheist Alliance International
Washington DC, USA
Both
Global federation of atheist groups raising awareness of atheism and secularism, supporting atheist causes worldwide with UN consultative status.
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Atheist Centre
Vijayawada, India
In-Person
Pioneering institution founded in 1940 by Goparaju "Gora". Engages in rural social work and public education to propagate atheism, women's rights, caste elimination, and scientific outlook.
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Atheist Republic
Global, International
Both
Largest online atheist community with local "consulates" worldwide, providing news, forums, and support for atheists.
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Center for Inquiry
Amherst, NY, USA
Both
International organization promoting science, reason and secularism - advocating for church-state separation and scientific skepticism.
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Freedom From Religion Foundation
Madison, WI, USA
Both
Non-profit representing atheists and agnostics (the largest in N. America, ~38,000 members), working to keep religion out of government.
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Human-Etisk Forbund
Oslo, Norway
Both
One of the world's largest humanist organizations (78,000+ members), providing humanist officiants for life rituals and advocating for a secular state.
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Humanists International
London, United Kingdom
Both
The global umbrella of 100+ Humanist, atheist, and secular groups in 40+ countries, promoting humanist values and human rights at the UN and beyond.
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Humanists UK
London, United Kingdom
Both
The UK's largest humanist organization (founded 1896), promoting secular humanism, providing humanist ceremonies, and campaigning for equal treatment of non-religious people.
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Sunday Assembly
London, United Kingdom
In-Person
A global network of secular congregations that meet like church without God for community, music, and charitable works; started 2013.
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American Ethical Union
New York City, USA
In-Person
Federation of 20+ Ethical Culture societies (religious-humanist congregations) across the U.S., founded 1876 by Felix Adler.
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