This study investigates the impacts of ownership structure on dividend policy in Thailand over the periodv2002-2010. The results show that Thai firms have highly concentrated ownership structure and are mostly owned by institutions. The dividend policy of Thai firms is analyzed in two steps: (1) decision to pay or not to pay and (2) how much to pay. The results reveal that, among controlled variables, profitability, firm size, and the ratio of retained earnings to book equity, have positive effects on a firm’s decision whether to pay dividends and how much to pay dividends. In addition, the amount of dividend payouts is found be positively related to growth opportunities but negatively related to financial leverage. Free cash flow, however, is not found to have a significant relation with dividend policy of Thai firms.