Academia, though not immediately associated with preserving humanity in war, has been instrumental in advancing international humanitarian law (IHL). Since the 1864 Geneva Convention, scholars have supported the International Committee of the Red Cross (ICRC) by promoting IHL, researching it, and helping the law develop. In a world facing 130 armed conflicts, rising polarization and dehumanization, and a paradoxical mix of interest in and disillusionment with IHL, academia’s role is more vital than ever. Despite its contributions, however, limited scholarship exists on how academia has supported the ICRC in preserving humanity in war by contributing to IHL. How has academia promoted this body of law? How has research strengthened IHL as the cornerstone legal framework that it is today? What role have academics played in its normative development? This article explores these questions, examining academia’s endeavours to promote IHL through education, advocacy and public engagement; its research efforts to consolidate IHL, clarifying it and supporting its implementation; and its contributions to IHL’s development, from involvement in treaty-making to proposing new norms. The piece also calls for reforms in IHL education to enhance its impact, advocates for multidisciplinary and ethical research focused on compliance and other pressing issues, and urges greater inclusion of academia in structures and processes aimed at developing the law. Finally, the article concludes by issuing a call to action for States, universities and academics, and outlining pathways to collectively strengthen IHL and uphold humanity in war.