This article aims to deepen scholarly understanding of the Law and Society Movement (L&S) and thereby strengthen debates about the relation between Empirical Legal Studies (ELS) and L&S. The article departs from the observation that ELS, understood as an initiative that emerged in American law schools in the early 2000s, has been quite successful in generating more attention to the empirical study of law and legal institutions in law schools, both in- and outside the US. In the early years of its existence, L&S – another important site for the empirical study of law and legal institutions – also had its center of gravity inside the law schools. But over time, it shifted towards the social sciences. This article discusses how that happened, and more in general explains how L&S became ever more diverse in terms of substance, theory and methods.