Whether willingly or not, the sociology of religion has become increasingly influenced by organizational theories and research. Despite objections, the sociology of religious organizations is an area of study rising in prominence. Growth comes from both explicit and implicit applications of organizational theories. In a push toward more explicit connections, we review three organizational theories with particular relevance to the study of religion: organizational ecology, resource dependence, and new institutionalism. For each, we suggest possible paths for future research. Methodological challenges complicate this research. Religious organizations vary widely in size and scope. The advent of new nationally representative surveys of religious congregations opens new analytic opportunities, although these data remain limited in significant ways. In closing, theoretical and methodological implications for the sociology of religious organizations are discussed.