Atheist Community of San Jose is an organization for atheists and like-minded non-believers, founded to develop and support the atheist community and to provide opportunities for socializing, philanthropy, education, and friendship. 

Bay Area Humanists  promote humanism -- an ethical, democratic, naturalistic life stance that prioritizes reason, scientific, and critical thinking -- as well as a system of humanist ethics and secular values as a rational alternative to ethics/values based on religion.

Bay Area Skeptics is one of the SF Bay Area's oldest and longest running science and skepticism organizations, promoting reason and critical thinking through regular meetings, SkepTalks, and social media.

Camp Quest West  provides an educational adventure -- shaped by fun, friends, and freethought -- featuring science, natural wonder, and humanist values

Central Valley Alliance of Atheists & Skeptics (CVAAS) is a voice for secular and rational people in the California Central Valley.


Einstellung Labs is working at the intersection of the for-profit and non-profit sectors. 

"At Einstellung Labs we design creative solutions for new challenges in new ways."

Guerrilla Skepticism on Wikipedia editing team improves skeptical content on Wikipedia by improving pages of our skeptic spokespeople, providing noteworthy citations, and removing the unsourced claims from paranormal and pseudoscientific pages.

Independent Investigations Group is the local affiliate of an international network of trained investigators who will not only look into paranormal, fringe science, and extraordinary claims in their own regions, but also administer the IIG $100,000 Challenge.

Sacramento Area Skeptics is a nonprofit dedicated to promoting scientific skepticism in our community and around the world.

Secular Coalition for California  represents secular Californians in our state capitol.

Stanislaus Humanists believe in doing good for its own sake. We're all about educating ourselves on how to make this world a better place, and we encourage and support each other in putting our knowledge into action.

Sunday Assembly East Bay is an inclusive secular group that builds community with a monthly singing event, service projects, and topical small groups.

Sunday Assembly Silicon Valley is a radically inclusive local branch of Sunday Assembly (featuring all the best bits of church without the religion) that celebrates life and welcomes all people, with or without faith, and supports everyone fulfilling their potential.


Wonderfest, the Bay Area Beacon of Science produces in-person and online science programs that stimulate curiosity, promote careful reasoning, challenge unexamined beliefs, and inspire life-long learning.

Is your organization interested in sending a representative to SkeptiCal? Contact to apply for an exhibitor table at SkeptiCal!