Social psychology is concerned with how individuals, groups and societies interact and influence each other across implied, imagined or actual scenarios (Allport, The nature of prejudice, Addison-Wesley, 1954; Augoustinos & Walker, Social cognition: An integrated introduction, 2nd ed., SAGE Publications, 2008). Though having a surprisingly long past—going back as far as Socrates—social psychology has only a relatively short scientific history, beginning in the late 1800s. As such, social psychology is considered a broad subdiscipline of psychology with strong links to sociology and other applied social sciences. Typically, anything that involves the study of feelings, thoughts and behaviours within social contexts is relevant to social psychology (Crawford & Novak, Individual and society: Sociological social psychology, Routledge, 2018), and therefore it is a vital lens for forensic psychologists to understand the risk and perpetration of offending behaviour. In this chapter, we focus on the core areas of social influence, social learning and social perception to explore dynamics between individuals, groups and society, and investigate how these might aid understanding of criminal behaviour and shape forensic psychology practice.