This chapter addresses the forms and expression of normative pluralism in contemporary Vietnam. Drawing on two qualitative case studies, this chapter examines specifically the relationships between three social regulatory regimes: norms of interpersonal networks, market rules and state laws. A first vignette focuses on party-state interventions in the local customs and sociability practices of the Tày populations of Vietnam’s northern uplands. The second vignette examines the institutionalisation process of online sales of fresh food products in Hanoi. Based on these cases, we conceptualise five modes of interaction between normative systems: coexistence, combination, opposition, substitution and hybridisation. Combining typological distinctions with systematic empirical contextualisation, this chapter sheds light on particular institutional arrangements where a significant part of fluidity, impermanence and variation infuses the necessarily organised, fixed and stable aspects of the institutional order.