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Introduction: Current research on sport motivation mostly focuses on the Self-Determination Theory, which has brought a qualitatively novel approach in the field by making a distinction between six types of motivation. The present study tested the reliability and validity of the Hungarian adaptation of the Sport Motivation Scale II (SMS-II) with a large sample of athletes. The assessment of the psychometric properties focused on the factor structure, construct validity and convergent validity of the Hungarian version. Methods: The sample included 1197 Hungarian athletes aged 11 to 67 years, who engaged in more than 50 different sports. The test battery comprised the Hungarian adaptations of the SMS-II, the Satisfaction With Life Scale (SWLS-H), the Rosenberg Self-Esteem Scale (RSES), the Competitive State Anxiety Inventory 2 (CSAI-2), and the Flow State Questionnaire (PPL-FSQ). Results: Considering that each subscale of the SMS-II consists of only three items, all subscales showed acceptable internal consistency. A confirmatory factor analysis revealed that the original sixfactor model showed the best fit with the data. All fit indices obtained for this model fell within the acceptable range. The examination of construct validity revealed the expected simplex pattern of the subscales, while the associations between the SMS-II and the measures used to test convergent validity were consistent with those obtained in previous studies. Discussions: The Hungarian version of the SMS-II provides a reliable and valid measure of sport motivation based on the Self-Determination Theory. The only inconsistency between the observed data and the theoretical model was that intrinsic motivation did not show a closer association with integrated regulation than with identified regulation, which finding is probably related to the contents of the involved subscales. Conclusions: A possible future direction of construct validity analysis and improvement may be focused on content refinement. Specifically, the construct validity of the Hungarian SMS-II could possibly be improved by completing the items assessing intrinsic motivation with references to the positive experience directly related to the activity itself. [ABSTRACT FROM AUTHOR]