This research investigates the impact of corruption on tourism demand in Thailand through econometric analysis. By examining panel data from twenty primary source markets spanning the years 2000 to 2019. The findings demonstrate a significant association between improvements in the Corruption Perception Index (CPI) and an increase in tourist numbers. These results have substantial policy implications, suggesting that institutional reforms and the promotion of public participation aimed at reducing corruption could effectively enhance Thailand's tourism sector and foster sustainable, long-term growth.