Background: Bullying among adolescents is a global public health issue and has adverse behavioral and mental health consequences, yet a little is known about the relationship between bullying victimization and adverse health behaviors in adolescence in South Asian countries. Methods: Data for this cross-sectional analysis were extracted from the global school-based student health survey (GSHS) in Bangladesh (n = 2,989), 2014 and in Nepal (n = 6,529), 2015. Multivariate logistic regression analyses were used to identify the associations between bullying victimization and adverse health behaviors or outcomes: physical violence, sexual history, tobacco use, alcohol use, drug use, suicide ideation, plan, attempt, loneliness, and sleeping difficulty. Results: The prevalence of bullying victimization that occurred for a minimum of 1 day during the 30 days preceding the survey was 24.5% in Bangladesh and 50.9% in Nepal. This study observed significant relationships between bullying victimization