This handbook provides a comprehensive look at the study of gender and security in global politics.The volume is based on the core argument that gender is conceptually necessary to thinking about central questions of security; analytically important for thinking about cause and effect in security; and politically important for considering possibilities of making the world better in the future. Contributions to the volume look at various aspects of studying gender and security through diverse lenses that engage diverse feminisms, with diverse policy concerns, and working with diverse theoretical contributions from scholars of security more broadly. It is grouped into four thematic sections: Gendered approaches to security (including theoretical, conceptual, and methodological approaches); Gendered insecurities in global politics (including the ways insecurity in global politics is distributed and read on the basis of gender); Gendered practices of security (including how policy practice and theory work together, or do not); Gendered security institutions (across a wide variety of spaces and places in global politics). This handbook will be of great interest to students of gender studies, security studies and IR in general.