The aim of the current research was to find out the correlative and causal relationships between proactive personality, teacher autonomy support and growth mindset in Secondary School Students. The sample consisted of 377 male and female secondary school students, of whom 61 were males and 316 females. The average age was 15.98, with a standard deviation of 0.54. The proactive personality scale (translated and codified by the researcher), the teacher autonomy support scale (translated and codified by the researcher), and the growth mindset scale (translated and codified by the researcher) were applied. The results revealed that there were statistically significant positive correlations between proactive personality, teacher autonomy support with its dimensions and growth mindset with its dimensions. Results also led to a significant causal model between proactive personality, teacher autonomy support dimensions, and growth mindset dimensions in secondary school students.