There are many worthy humanist and freethought organizations, nationally and worldwide, that take a broadly naturalistic approach to understanding the world and ourselves. Not surprisingly, they tend to be progressive as well.  For another good listing of these, please see the Recommended Sites at the Freethought Forum.  Supporters of naturalism, directly or indirectly, include:

	American Humanist Association
	Brights
	British Humanist Association
	Center for Inquiry
	Council for Secular Humanism
	Freethought Forum
	Humanist Institute
	Institute for Humanist Studies
	Institute on Religion in an Age of Science (IRAS)
	International Humanist and Ethical Union
	One With Everything.Org
	National Secular Society (Britain)
	Skeptics Society
	Secular Coalition of America
	Secular Web
	World Pantheism

	Applied Naturalism Group
	Naturalism Philosophy Forum
	Determinism Group
	Society for Natural Science
	Religious Naturalism Group

	National Center for Science Education
	SETI Institute, the search for extra-terrestrial intelligence
	Edge.Org - interviews and papers by cutting edge thinkers

 

	MIT Brain and Cognitive Sciences
	Tufts Center for Cognitive Studies
	American Association for Artificial Intelligence
	Institute for Human and Machine Cognition

	Association for the Scientific Study of Consciousness
	Tucson Conference:  Towards a Science of Consciousness

	Access Research Network  This is a high-powered organization promoting "intelligent design" theories (antithetical to naturalism) via their journal Origins and Design, with authors such as Mike Bethe and Phillip Johnson.
	Discovery Institute  Its avowed mission is "nothing less than the overthrow of materialism and its damning cultural legacies".