Global policy making is unfurling in distinctive ways above traditional nation-state policy processes. New practices of transnational administration are emerging inside international organizations but also alongside the trans-governmental networks of regulators and inside global public private partnerships. Mainstream policy and public administration studies have tended to analyse the capacity of public sector hierarchies to globalize national policies. By contrast, this Handbook investigates new public spaces of transnational policy-making, the design and delivery of global public goods and services, and the interdependent roles of transnational administrators who move between business bodies, government agencies, international organizations, and professional associations. This Handbook is novel in taking the concepts and theories of public administration and policy studies to get inside the black box of global governance. Transnational administration is a multi-actor and multi-scalar endeavour having manifestations, depending on the policy issue or problems, at the local, urban, sub-regional, sub-national, regional, national, supranational, supra-regional, transnational, international, and global scales. These scales of ‘local’ and ‘global’ are not neatly bounded and nested spaces but are articulated together in complex patterns of policy activity. These transnational patterns represent a reinvigoration of public administration and policy studies as the Handbook authors advance their analysis beyond the methodological nationalism of the nation-state.