Achieving gender equality has been a prioritized goal of the international community for many years, yet women in the world today still face injustice, exclusion and violence. To track progress on women’s rights and female empowerment, quantitative and comparable indices on a global scale are useful. This is the background for introducing the new Women, Peace, and Security Index, created by researchers at the Georgetown Institute for Women, Peace and Security (GIWPS) and the Peace Research Institute Oslo (PRIO). Women’s wellbeing is measured along three dimensions – inclusion, injustice, and security. The index provides an important tool with which to understand key achievements, as well as insights into the work that remains to achieve gender equitable societies.