Javad Amani Sari Baglo, Rahim Bardi, Ghafour Ahrari, Navideh Jahadi, Hojjat Mahmoudi, Students Perceived School Culture, Basic Psychological Needs, Intrinsic Motivation and Academic Achievement: Testing a Casual Model, The Social Sciences, Volume 9,Issue 3, 2014, Pages 219-227, ISSN 1818-5800, sscience.2014.219.227, (https://makhillpublications.co/view-article.php?doi=sscience.2014.219.227) Abstract: The purpose of the present research was to examine the relationship between students perceived school culture, basic psychological needs, intrinsic motivation and academic achievement in a causal model. The 296 high school students (159 females and 137 males) in Tabriz, North-West of Iran, participated in this research and completed the students perceived school culture questionnaire based on Hofstede’s cultural dimensions (femininity, uncertainty avoidance, collectivism and power distance), basic psychological needs and intrinsic motivation. The results of the path analysis showed that fulfillment of basic psychological needs and intrinsic motivation has positive effect on academic achievement. Uncertainty avoidance and power distance have also negative effect on fulfillment of psychological needs but the influence of femininity on this variable was positive. Also, collectivism has no significant effect on it. In general, the findings showed that if school culture supports students autonomy, they will experience fulfillment of their basic psychological needs and attain higher intrinsic motivation and academic achievement. Keywords: School culture hofstede’s cultural dimensions;self-determination theory;intrinsic motivation;basic psychological needs;academic achievement