This article is conceived as an overview of the career and scholarship of Claude Langlois. It emphasizes the breadth, diversity, and volume of his work, giving particular attention to four fields in which Langlois made especially important contributions. These fields to some extent mark four phases of his scholarly career-although not necessarily in chronological order. These are historical religious sociology, the French Revolution, women and religion, and theology and spirituality. The conclusion stresses the originality and independence of thought displayed by Langlois throughout his career.