This chapter examines the development of public law in South Asia: a legal family that has been defined by its history of British colonialism and continued adherence to the common law legal tradition. It traces the evolution of constitutionalism in four countries – India, Bangladesh, Pakistan and Sri Lanka – since their independence from Britain, focusing on two common regional themes. The first is the judicialisation of politics through the adoption (or at least consideration) of the basic structure doctrine, which permits courts to define and enforce implicit limits on constitutional amendments. The second is the centralisation (and abuse of) executive power, which has imperilled democratic rule in all four countries. While neither of these developments is specific to South Asia, the interplay between them, resulting in separate spheres of unchecked judicial and executive domination, is perhaps unique to the region and warrants further attention from comparative scholars.