The present study investigated relationships among false belief, emotion understanding, and social skills with 60 3- to 5-year-olds (29 boys, 31 girls) from Head Start and two other preschools. Children completed language, false belief, and emotion understanding measures; parents and teachers evaluated children's social skills. Children's false belief performance related to their understanding of their friend's emotions and to teacher's ratings of social skills. Aspects of emotion understanding related to social skills. Head Start (n = 30) and non-Head Start preschoolers (n = 30) performed similarly on social skills and emotion understanding measures, however, non-Head Start children performed significantly better on false belief tasks than Head Start children. Results demonstrate the importance of including diverse groups of children in studies of social cognition.