Disseminating data is a core mission of international organizations (IOs). IO lending and conditionality may incentivize governments to collect and disclose aggregate economic data. We explore the association between loans from the Bretton Woods Institutions (BWIs) and an index of economic transparency derived from the data-reporting practices of governments to the World Bank. Using a matching method for causal inference complemented by a multilevel regression analysis, we find consistent evidence of a positive and statistically significant effect of BWI loans on the improvement of the level of economic transparency in developing countries.