Book excerpt: The Yearbook of International Religious Demography presents an annual snapshot of the state of religious statistics around the world. Every year large amounts of data are collected through censuses, surveys, polls, religious communities, scholars, and a host of other sources. These data are collated and analyzed by research centers and scholars around the world. Large amounts of data appear in analyzed form in the World Religion Database (Brill), aiming at a researcher’s audience. The Yearbook presents data in sets of tables and scholarly articles spanning social science, demography, history, and geography. Each issue offers findings, sources, methods, and implications surrounding international religious demography. Each year an assessment is made of new data made available since the previous issue of the yearbook. The 2018 volume features a wide range of subjects, including approaches to measuring religious violence, religious changes in the Indian Subcontinent, religious demography in Lebanon, Baptism and Godparenthood in Catholic Europe, the relevance of social media data for religious demographic research, and the methodological and practical challenges of measuring religiosity in Turkey. Contributors are: Todd M. Johnson, Gina Zurlo, Peter Crossing, Robert Brathwaite, J. K. Bajaj, M. D. Srinivas, Wissam Raji, Yves Rahme, Marc Zeinoun, Charbel Zeidan, Guido Alfani, Joey Marshall, Zubeyir Nisanci, Juan Carlos Esparza Ochoa, María Concepción Servín Nieto.