Feminist Security Theorizing is in many ways what it sounds like—thinking about security in the global political arena through gender lenses. Since early work in feminist International Relations (IR), feminists have been exploring research questions about the ways that gender shapes and is shaped by war, conflict, and militarism. The field has developed to be labeled Feminist Security Studies (FSS). Debates about whether FSS is “feminist security” studies or feminist “security studies” have asked about the subfield’s focus—whether it is toward rethinking security in feminist ways or toward the mainstream field of security studies as such. With space in the field for both approaches, feminist security theorizing has looked at revealing the importance of gender in conceptualizing security, demonstrating that gender is key to understanding causes and predicting outcomes, and showing gender as a key part of solving security problems. FSS has several common theoretical commitments and concerns. These include a necessary commitment to intersectionality, a recognition of the importance of theorizing not only about gender but also about sexuality, a consciousness about framing, and an awareness of the politics of sociology of the academic disciplines in which it is situated. It is important to explore the past, present, and potential futures of feminist theorizing about security, concluding with an invitation to expand recognition of feminist work addressing security issues across an even wider variety of perspectives.