Globally, children and adolescents are growing up in societies marked by stark economic inequality. Along with a robust body of scholarship highlighting the importance of economic security for children's health and well-being, researchers are beginning to examine how children and adolescents think and feel about their own and others' economic circumstances or social class position (Ruck et al., 2019). Reflecting diverse theoretical traditions, recent studies have, for example, investigated social class identity (Destin, 2019), stereotypes about the rich and poor (Sigelman, 2012), moral concerns for distributive justice (Elenbaas et al., 2020), and action for community and social change (Diemer et al., 2020). To further advance and motivate developmental intergroup perspectives on social class, in this article, we (1) define social class, (2) evaluate whether evidence about social class aligns with predictions from developmental intergroup theory (DIT) and social identity development theory (SIDT), (3) demonstrate how complementary insights from these perspectives can be integrated to advance research on social class, and ( 4) highlight what is unique about the study of social class from a developmental intergroup perspective.