The paper focuses on the activities and networks of the International Missionary Council (IMC). Founded in 1921, the IMC linked mission agencies, national Christian associations and other interdenominational organizations. It represented a slow transition from older, 'Western' conceptions of mission to an idea of 'World Christianity' that promised to include national churches and Christian communities around the globe on equal terms. Politically, the organization thus stood at the interception of an Anglo-American influenced liberalism and anticolonial sentiments that were especially influential in the "younger churches". Headquartered in London, New York and Geneva, the IMC was concerned with issues such as missionary cooperation, religious liberty, but also socio-economic issues like social work, education, or agriculture. The paper will focus on both the IMC's character as an international organization and its engagement with other, religious and secular international organizations and positioning within international relations and shifting geopolitics during the interwar period.