Using a novel subnational-level dataset of Thailand, the results show a strong spatial association between poverty and educational attainment in Thailand. Provinces with more educated populations are more likely to have lower poverty incidence. In particular, the findings of this study suggest that attainment of tertiary education can significantly affect poverty reduction, while the negligible effects of primary and secondary education could be due to the disparities in education quality. Therefore, the 9-year compulsory education provided by the Thai government might no longer be enough to reduce poverty, and tertiary education might play a more critical role in poverty alleviation.