This study investigates the relationships between tourism cluster characteristics, regional tourism policy process, inter-organization knowledge sharing, and regional tourism competitiveness. In order to analyze the fitness of a serious of structural models of the relationships, data are collected from 662 cluster members in the confucianism cultural area of Gyeongbuk through the administration of structured questionnaires. The results reveal that (1) context for firm strategy and rivalry, demand conditions, and supporting industries have positive effects on inter-organization knowledge sharing, (2) inter-organization knowledge sharing has significantly positive effect on regional tourism competitiveness, and (3) the relationships between tourism cluster characteristics and inter-organization knowledge sharing differ with respect to regional tourism policy process. Theoretical and practical implications are discussed and future research directions are outlined.