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Adolescents' involvement in bullying situations is—at least partially—personality trait‐activated. Although some studies investigated personality correlates of bullying and being victimized, little is known about personality correlates of bystander responses (i.e., reinforcing, outsider behavior, indirect defending, and direct defending). The present study investigated whether Dutch adolescents' self‐reported HEXACO personality traits could explain their peer‐reported involvement in bullying (N = 552; M_age = 13.4 years, SD = 0.8 years). The results show that bullying was negatively related to honesty‐humility, emotionality, agreeableness (for boys specifically), and openness, whereas reinforcing was only negatively related to honesty‐humility and openness. Conversely, direct defending and outsider behavior were positively related to honesty‐humility, emotionality, and openness, whereas indirect defending …