The World Religion Database (WRD), hosted at Boston University’s Institute on Culture, Religion and World Affairs (CURA), contains detailed statistics on religious affiliation for every country of the world. It provides information from country censuses as well as best estimates for every religion to offer a definitive picture of religion and non-religion in the past, present, and future. The WRD offers best estimates at multiple dates for each of the world’s religions (18 categories, including atheists and agnostics) for the period 1900 to 2050. The WRD will be updated with new information as it becomes available, such as estimates of religious affiliation at the province level within countries and religious freedom information for all countries.