What effect does variation in dual citizenship policies of both sending and receiving societies have on bilateral migration flow? Employing a modified gravity model, we use a new dual citizenship database to examine the effects of allowance within 14 Organisation for Economic Co-Operation and Development (OECD) receiving states and more than 100 sending states between 1980 and 2006. We show that dual-citizenship-allowing sending states experience significantly more migration than dual-citizenship-forbidding sending states. We also find a significant increase in migration flow in receiving states that allow for dual citizenship, consistent with previous research. Finally, interaction effects reveal highest flow between sending and receiving states allowing dual citizenship and lowest flow between forbidding sending states and allowing receiving states. These findings emphasize the importance of citizenship policy contexts of countries of origin in influencing a migrant’s decision to move. They also suggest that migrants are rational and informed, valuing the "goods" of citizenship—from political rights to security of status and mobility—in both origin and destination states.