School bullying still remains an important concern. While there is growing knowledge about the nature, extent and effects of school bullying, we still lacking research on personality traits and involvement in bullying. This article seeks to examine the relations between personality traits (extraversion and neuroticism) and being involved in school bullying (as bully, victim, or bully-victim) among Lithuanian adolescents. We expected that higher scores on extraversion will be more positively related with adolescent bullying, as neuroticism will be more positively related with victimization. Additionally, we expected that both personality traits would predict adolescents' involvement in bullying (being bullies and victims). A sample of 766 adolescents (418 girls and 348 boys; ages between 13- and 15 years old) completed measures of extraversion and neuroticism, as well as measures of bullying in school. Results indicated that bullying in school remains a serious issue as more than half of adolescents' experience victimization and almost half of them were bullies themselves. Using logistic regression analyses, it was found that higher extraversion was positive predictor of being bullies, but not related with victimization. Higher neuroticism was positive predictor of victimization. The results reveal that both higher extraversion and neuroticism are positive predictors of being bully and victim. Taking together, the results added to scientific evidence that both personality traits could be predictors of adolescents' involvement in school bullying.