Antimicrobial resistance has attracted growing attention as a global challenge that not only crosses national borders but also sectoral boundaries. Like many contemporary issues, antimicrobial resistance is governed globally by an array of norms, policies and institutions without central control. Drawing on an interdisciplinary approach from medicine and international relations/law, this doctoral dissertation aims to understand the nature and extent of the ‘regime complex' on antimicrobial resistance based on the analysis of primary documents from international organizations. In addition to the main manuscript, this dissertation is constituted of three articles published in peer-reviewed journals and a report produced for the UN Interagency Coordination Group on Antimicrobial Resistance.