Phenomenology of religion can refer to three distinct groups of phenomenological projects reflecting on religion. The term is used in the field of religious studies to designate the search for patterns of religious experiences or practices across traditions and to the methodology that shows religion to be a unique human experience deserving its own field of study. Philosophical phenomenology in the Husserlian tradition also engages religious questions at times. Finally, there is a group of contemporary French philosophers who advocate a (...) phenomenology of religious experience. The first two groups are examined in this article and the third in the sequel. For the first group, the article briefly considers the projects of Rudolf Otto, Mircea Eliade, Brede Kristensen, and Gerardus van der Leeuw, as well as their contemporary interpreters in the field of religious studies. As representative of the second approach, the article considers Max Scheler, Edith Stein, and Gerda Walther as well as commenting briefly on the contemporary work of Natalie Depraz and Anthony Steinbock. (shrink)