Background & Objective: Self Confidence, is a continuous evaluation of an individual on himself. Hence it is important regarding the mental health and the personality balance. Due to the problems that low self-confidence brings about especially during the youth age and regarding the prevalence of this problem among adolescents, the present research was conducted in order to investigate the level of self-confidence among students.

 Methods: Self-confidence of 500 students was determined using Eysenck test. Multistage sampling was employed to select 7 out of 15 boys high schools randomly In each grade of study the required numbers were chosen randomly proportionate to the number of students in that grade. Scores more than 21 showed high self-confidence, 14-21 average and less than 14 indicated low confidence. To analyze the data, Chi- square and Mantel- Hanzel tests were used, with 95% significance.

 Results: 29.6% of students have had high self-confidence, 57.8% of them had average self-confidence while 12.6% of them had lower level of self-confidence. No significant relationship was seem among the rank of birth and the literacy of parents with the level of self-confidence. However there was a significant relationship between the number of siblings (P=0.0135) and study grade (P=0.0018) with the level of self-confidence. As a result, 11.5% of the students in the first grade, 6.6% in the second grade and 20.5% in the third grade had low self-confidence.

 Conclusion: The prevalence of�low self-confidence among third grade high school students, warns that they should be paid much attention by their parents and their school officials.