Previous research on religion and CMC has focused primarily on Christianity and the Western world. The articles collected in this special theme section of the Journal of Computer-Mediated Communication examine a wide range of religions online through both quantitative and qualitative methodologies. The Abrahamic traditions of Judaism, Christianity, and Islam, as well as Hinduism, Shinto, Taoism, Chinese traditions, animism, Japan’s New Religions, and diverse forms of Buddhism are examined, in an equally wide range of national cultures and traditions: Israel, Egypt and the Arab world more broadly, India, Japan, Malaysia, Singapore, and the United States. Individually and collectively, the articles highlight shared characteristics of religion cross-culturally that foster or hinder religions’ migration online—a migration that most, although not all, religions undertake in varying degrees.