This open access handbook aims to constitute a reference point on political norm dynamics in Southeast Asia, by bringing together the array of normative repertoires that frame the possibilities for citizens to participate in, set agendas for, make decisions in, and contest, not only electoral and institutional politics but also informal and imaginary political spaces. It sheds light on intersecting political and social transformations and their consequences from the vantage point of political norms. While chapters lay out and analyse how political norms across Southeast Asia have been shaped in successive historical phases, the core of the handbook addresses current dynamics involved in defining and transforming political norms.