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Association for the Sociology of Religion (USA)
British Sociological Association
Religious Research Association (USA)
SISR International Society for the Sociology of Religion
their useful links page
Society for the Scientific Study of Religion (SSSR)
Critical Theory of Religion Group
Sociology of Religion Research Network
The Religious Studies Project helps disseminate contemporary issues in RS to a wider audience and provide a resource for undergraduate students of RS, their teachers, and interested members of the public. It contains weekly podcasts and interviews with leading scholars of religion and articles by postgraduates on the weekly themes.
The Hartford Institute for Religion Research has a site listing resources for the sociology of religion at http://hirr.hartsem.edu
The Religion Section of the American Anthropological Association has a useful site (with further links) at www.uwgb.edu/sar/
See also the Social Science Information Gateway section on Sociology of Religion.