The majority rule is a core decision-making principle in groups and democracies, where the preference of over half the members determines the collective outcome. This study investigated whether children aged 3-5 (N = 156, approximately 50% girls and boys, from predominantly White families) apply the majority rule in a group of peers with differing preferences. Results showed that 5-year-olds, but not 3- or 4-year-olds, were more likely to choose activities favored by the majority of their peers. When justifying their choices, 5-year-olds more frequently referred to the majority rule than younger children. Results also showed that children supported a teacher's decision regardless of whether she followed the majority or the minority. These results are discussed in terms of children's ability to apply the majority rule in social settings.