The article analyzes how personality determines the civic activity of young voters in Poland. To check this, empirical research combining Big Five traits (extraversion, agreeableness, conscientiousness, emotional stability, intellect) and, unlike other studies, four types of civic activity (social commitment, political participation, electoral participation, individual political activity) was conducted. The OLS regression analysis revealed a significant effect of extraversion on most manifestations of civic activity. Those who score higher on this trait were more likely to involve in individual political activity, social commitment, and political participation. Moreover, intellect was associated with individual political activity, while emotional stability had no significant impact on civic activity. The study also discovered some dependencies with the other Big Five traits. Agreeableness positively influenced social commitment and electoral participation, while conscientiousness increased political participation.