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The study aims to investigate the relations between three adolescents’ motivational beliefs and science achievement at an international scope. Based on the expectancy-value theory, the expectancy and task value beliefs have different predictive magnitude for explaining student achievement. The data of the eighth grade students from 26 countries participating in the Trends in International Mathematics and Science Study (TIMSS) 2011 were examined. The degree of predictive power between the three motivational beliefs and achievement from the strongest to the least strong is self-concept, intrinsic value and utility value in general, with a few countries as exceptions. The results of this study shed light on different motivational dynamics across countries.