The today, social responsibility is not limited to a specific organization, and clubs and sports teams have included various forms of social responsibility in their goals and are involved in their implementation. The purpose of this study is to investigate the effect of club social responsibility on brand supportive behavior by mediating the positive attitude and moral feelings of fans. The present study is an applied research in terms of purpose and quantitatively strategically and in terms of correlation implementation path, field data collection and prospective in terms of time. In the present study, Persepolis Club was selected as the study club and the statistical population of the present study consisted of all fans of Persepolis Club. 270 people were selected as the research sample and were selected by available sampling method and voluntarily. According to the objectives of the study, appropriate tools for this study were considered questionnaires; for this purpose, to assess social responsibility, (Galbraith, 2010) questionnaire, brand supportive behaviors, )Xie et al, 2019) questionnaire, and to measure the mediating variables of positive moral attitudes, (Xie et al, 2019) questionnaire were used. Confirmatory factor analysis and mediating the effects and mediating role of the research were analyzed at 5% error level using 25 SPSS and Smart PLS 3. 2. 9 software. The results showed that social responsibility has affected the supportive behaviors of the brand, the attitude of the fans and their moral feelings. Also, the attitude and moral feelings of the fans have affected the supportive behaviors of the brand. The relationship with the impact of social responsibility on supportive behaviors was confirmed. Therefore, it is recommended to the management of sports teams to take into account the interests of the fans in social issues and to include various plans of social responsibility in their long-term plans.