This paper explores two different versions of ‘the realist turn’ in recent political theory. It begins by setting out two principal realist criticisms of liberal moralism: that it is both descriptively and normatively inadequate. It then pursues the second criticism by arguing that there are two fundamentally different responses among realists to the alleged normative inadequacy of ideal theory. First, prescriptive realists argue that the aim of realism is to make political theory more normatively adequate by making it more realistic. Interpretative realists, on the other hand, argue that realist theorising should detach itself from such an aspiration, and instead aim at theoretical understanding rather than normative prescription. After so...