The purpose of this study was to analyze the relationship between the level of physical activity, social physique anxiety, and academic achievement. This study evaluated 524 students in total from four schools in İstanbul province, 272 of whom were female and 252 were male students. In order to determine the level of physical activity of students, Physical Activity Questionnaire for Older Children (PAQ-C), developed by Kowalski et al., was used. Validity and reliability of the scale for Turkish population was tested by Sert and Temel. As for establishing the levels of social physique anxiety of students, the scale of Social Physique Anxiety, developed by Hart et al. and adapted to the Turkish society by Doğan was used. For the statistical analyses, averages of the level of physical activity, social physique anxiety, and school academic score were taken. By using Pearson correlation coefficient, the relationship between the averages was checked and the level of significance was set at p<0.05. The results show that, irrespective of gender difference, there is a relationship between physical activity and social physique anxiety (r=-.227; p<0.01) and between physical activity and academic achievement (r=.103; p<0.05). When the gender difference is taken into account, there is a relationship between physical activity and social physique anxiety (r=-.171; p<0.01) and between physical activity and academic achievement for females (r=.207; p<0.01). For males, there is a relationship between physical activity and social physique anxiety (r=-.247; p<0.01), but there is no relationship between physical activity and academic achievement (r=.083; p>0.05).