This study operationally defines Buddhist belief in merit (punña), Buddhist religiousness and examines their relationships with life satisfaction. Four hundred Buddhist merit makers at a temple in Bangkok participated in the study. LISREL models show that Buddhist belief in merit predicts Buddhist religiousness and life satisfaction, and Buddhist belief in merit mediates the relationship between Buddhist religiousness and life satisfaction. The different conceptualizations of Buddhist religiousness and life satisfaction and their difference with reference to the future and the present are discussed. Buddhist religiousness-life satisfaction nexus is then examined against western religiousness-life satisfaction relationship.