By pressuring governments to hold democratic elections and by becoming directly involved in the electoral process through technical assistance and funding or as election monitors, international actors now play a visible role in domestic elections and other democratic processes throughout the developing world. although scholars have documented several macrolevel relationships between international-level variables and movement toward democracy, there has been little attention paid to the microlevel effects of international involvement in the democratization process. this article examines the effects of international election observation as a prominent form of international involvement in domestic elections and exploits a natural experiment in order to test whether international observers reduce election fraud. using data from the 2003 presidential elections in armenia, the article demonstrates that although observers may not eliminate election fraud, they can reduce election-day fraud at the polling stations they visit. the unusual advantage of experiment-like conditions for this study offers unique causal evidence that international actors can have direct, measurable effects on the level of election-day fraud and, by extension, on the democratization process.