AbstractThis article makes an intervention in the study of the May Fourth Movement by examining the role the mass media played in the diplomatic and domestic mobilization processes set in motion by China’s experience at the Paris Peace Conference. In contrast with the mainstream narrative that constructs the May Fourth Movement as a spontaneous response to the loss of Shandong at Versailles, this article shows that it was preceded by a proactive diplomatic strategy to mobilize ‘public opinion’ over the Shandong question. The Chinese delegation’s decision to launch a media campaign in support of their diplomatic agendas at Versailles inadvertently turned domestic media into a platform for political debate. As a result of competition between the political elites who dominated the mediascape, discussions over the Shandong question shifted from focusing on international diplomacy to domestic politics in the spring of 1919. An examination of the ‘media war’ during the May Fourth Movement further demonstrates that the political elites’ variable ability to adopt media strategies to shape and channel public opinion resulted in changing the political landscape of the post-May Fourth era. By focusing on the role of the mass media in the diplomatic and domestic mobilization in China’s strategy at Versailles and during the May Fourth Movement, this article forges new connections between the international and the domestic. It also invites further reflections on the nature of the May Fourth Movement by showing that the media was a tool of political mobilization that connected the political elite to the masses.