In studies of the international dimensions of women's suffrage, the role of international organisations has been overlooked. This article examines the suffrage activities of the Pan-American Union (PAU), and in particular those of the Inter-American Commission of Women (IACW), between 1920 and 1945. Attentive to historical context, the examination suggests that international organisations can be both bearers of state interests and platforms for social movement interests. The article also argues that while not independent bureaucracies, the PAU and IACW nevertheless had some importance for suffrage that cannot be attributed either to their state members or to the suffragist movements.