The aim of this study was to examine whether attitudes about gay-related name-calling, social norms concerning gay-related name-calling among co-students, teacher intervention, and school-related support would predict whether secondary school pupils had called another pupil a gay-related name during the last month. A total of 921 ninth-grade pupils (aged 14 to 15 years) at 15 lower secondary schools from two regions in Norway participated in the study by filling out a questionnaire. A logistic regression analysis revealed that having a negative attitude toward calling someone gay-related names was negatively associated with having called a pupil gay-related names in the last month. However, having heard a pupil call another pupil gay-related names at school was the variable that most powerfully predicted this behavior. These findings give certain grounds for optimism regarding the prevention of gay-related name-calling and indicate that preventive measures aimed at students' awareness would probably make a difference.