Using insights from a review of recent research on social identity approaches to helping, the Chapter sets out four key elements of a social identity approach to helping in emergencies: the salience of social identity, the boundaries of social identity, the contents of social identity, and the strategic interests of social identity. Evidence that illustrates the impact of social identity processes on group size and helping, which has traditionally focused on the inhibition of helping in the presence of others, is then reviewed. Finally, recent developments in the literature on intergroup emotions are considered, and their impact on a social identity approach to helping in emergencies is explored, highlighting the relatively neglected social identity relationship between bystanders and perpetrators. The review concludes by considering the current state of knowledge of a social identity approach to helping in emergencies, and identifies important questions that remain to be addressed.