Since the mid-2010s, conflicts at UNESCO over the interpretation of Japanese colonial rule and wartime actions in the first half of the twentieth century in Japan, South Korea, and China have been fierce. Contested nominations include the Meiji Industrial Revolution Sites for the World Heritage List (Japan), the Documents of Nanjing Massacre for the Memory of the World (MoW) Register (China), and two still pending applications on the Documents on the Comfort Women (South Korean and Japanese NGOs). This paper examines the recent “heritage war” negotiations at UNESCO as they unfolded in a changing political, economic, and security environment. Linking World Heritage and MoW nominations together for a holistic analysis, this paper clarifies the interests of State actors and of various non-State actors, such as NGOs, experts, and the UNESCO secretariat. We discuss the prospects for these contested nominations and recommend further involvement of non-State actors to ensure more constructive and inclusive heritage interpretation to enable a more comprehensive understanding of history.