Introduction: The aim of this study was to investigate the barriers to participation in girls' physical activities and its relationship with academic motivation and depression.

Methodology: The statistical population of this study was 180 13-16 years old female students in Rivash city of Khorasan province. The instruments used in this study were the questionnaire on barriers to student participation in sports activities, the Harter questionnaire to determine the level of academic motivation and the Beck questionnaire to determine girls' depression.

Results: The results showed that in terms of priority, barriers to participation in physical activity (economic, cultural, physical and psychological), cultural barriers with (73.3) and economic barriers with (70.2%), the most, psychological barriers with (30.2) and physical barriers with (27.1) percent, have the lowest priority to participate in physical activity. The results of Spearman test showed that there is no significant relationship between economic and cultural barriers with girls' educational motivation, but there is a significant negative relationship between physical and psychological barriers with academic motivation. The results also showed that there is no significant relationship between economic barriers and depression in girls, but there is a positive and significant relationship between cultural, physical and psychological barriers with depression in adolescent girls.

Conclusion: Female students face many difficulties in participating in sports activities that they are interested in doing. If the necessary measures are taken to provide more and better use of sports and recreational facilities for adolescent girls, it is possible to reduce depression and increase their academic motivation.