Until recently, social class has been rarely studied in psychology, and when it was taken into account it was rather as a control demographic variable than as a variable of interest. The aim of this paper is to propose an integrated review of recent research in social psychology that examines how social class influences psychological functioning and behavior. This literature conceptualizes social class as a context of socialization that modulates access to resources, which shapes individuals ways of thinking, feeling and acting. We present three approaches that respectively focus on three distinct aspects of the social class context - economic, symbolic or cultural resources - and describe how these resources impact attentional focus, orientation towards the self or the environment and ways to define oneself as an individual. We review the supporting empirical evidence sustaining these approaches and discuss the relevance of the indicators used to measure social class (income, employment, level of education, perceived rank). Finally, we argue that an experimental social psychology of social class is particularly needed as it allows, through the manipulation of processes, to identify the mechanisms by which social class influences psychological functioning and behavior.