In recent years, Thailand has experienced the emergence of "overeducated" workers as the supply of university graduates in Thailand has outpaced growth in highskilledemployment opportunities. Using the 2007 to 2009 Thai Labor Force Survey, this paper quantifies the incidence of overeducation and estimates overeducation wage penalties among male university graduates.The results show that the incidence of overeducation is greatest among younger cohorts. Quantile wage regression results suggest that overeducation wage penalties for older workers capture the impact of unobserved low ability on wages. In contrast, persistent wage penalties of 1126% across the wage/ability distributions for younger workers are consistent with structuralimbalances in the Thai labor market. These imbalances make it difficult for university graduates to find jobs commensurate with their level of formal education and to achieve their full earning power. The wage penalties are especially large for new entrants into the labor market.