Although much has been written about cyberbullying on Facebook, literature about WhatsApp and cyberbullying is scarce. Based on a large-scale survey that examined the prevalence and expressions of cyberbullying the current cross-sectional study provides a detailed description of cyberbullying victimization in WhatsApp classmate groups across grade level and gender among Israeli school-age children and adolescents. The study included 4,477 elementary, middle, and high school students in Israel who completed questionnaires regarding cyberbullying victimization in their WhatsApp classmate groups.