The last few decades have seen remarkable developments in international criminal justice, especially in relation to the pursuit of individuals responsible for sexual violence and other gender-based crimes. Historically ignored, justified, or minimised, this category of crimes now has a heightened profile in the international political and judicial arena. Despite this, gender is poorly understood, and blind spots, biases, and stereotypes prevail. This book brings together leading feminist international criminal and humanitarian law academics and practitioners to examine the place of gender in international criminal law (ICL). It identifies and analyses past and current narrow understandings of gender, before considering how a limited conceptualization affects accountability efforts. The authors consider how best to implement a more nuanced understanding of gender in the practice of international criminal law by identifying possible responses, including embedding a sophisticated gender strategy into the practice of ICL, the gender-sensitive application of international human rights and humanitarian law, and encouraging a gender-competent approach to judging in ICL. The authors' aim is to strengthen efforts for accountability for all atrocity crimes-war crimes, crimes against humanity, genocide, and aggression.