This article examines the foundations of democratic citizenship along three dimensions: generalised trust in other people; norms of citizenship; and participation in organisations. Contrary to previous research, which mainly focuses on situational factors, this article scrutinises how individual predispositions, in terms of personality traits, influence the three dimensions of democratic citizenship. In accordance with recent research, personality is conceptualised according to the Big Five personality model encompassing the five traits Openness (to experience), Conscientiousness, Extraversion, Agreeableness and Neuroticism. Based on a nationally representative Danish survey, which includes a 60-item Big Five personality inventory, we show that personality traits to a considerable extent influence all three dimensions of democratic citizenship. Furthermore, for norms of citizenship and organisational involvement, the personality traits have differential impacts contingent on the norm and type of organisational involvement in question.